Add Community Sample Directory (#805)

* Move extra helloworld samples

* Add documentation for community samples

* Update readmes

community/README.md

@@ -15,6 +15,7 @@ improving docs, giving talks, etc.
 
 - [Introduction](#introduction)
 - [Knative authors](#knative-authors)
+  - [Authoring samples](#authoring-samples)
 - [Meetings and work groups](#meetings-and-work-groups)
 - [How can I help?](#how-can-i-help)
 - [Questions and issues](#questions-and-issues)
@@ -49,6 +50,24 @@ project was started by Google but has contributions from a growing number of
 industry-leading companies. For a current list of the authors, see
 [Authors](https://github.com/knative/serving/blob/master/AUTHORS).
 
+### Authoring samples
+
+Beyond the official documentation there are endless possibilities for combining
+tools, platforms, languages, and products. By submitting a tutorial you can
+share your experience and help others who are solving similar problems.
+
+Community tutorials are stored in Markdown files on
+[GitHub](./samples/README.md) where they can be reviewed and edited by the
+community.
+
+Please submit a Pull Request to the community sample directory under the
+Knative component that your tutorial highlights -
+[Serving](./samples/serving/), [Eventing](./samples/eventing/),
+or [Build](./samples/build/). A reviewer will be assigned to review your
+submission. They'll work with you to ensure your submission meets the
+[style guide](DOCS-CONTRIBUTING.md), but it helps if you follow it as you
+write your tutorial.
+
 ## Meetings and work groups
 
 Knative has public and recorded bi-weekly community meetings.

community/samples/README.md

@@ -0,0 +1,7 @@
+# Knative Community Samples
+
+This directory contains Knative sample applications submitted from the community.  
+
+| Sample Name                | Description                | Language(s)                |  
+| -------------------------- | -------------------------- | -------------------------- |
+| Hello World | A quick introduction that highlights how to deploy an app using Knative Serving. | [Clojure](./serving/helloworld-clojure/README.md), [Dart](./serving/helloworld-dart/README.md), [Elixir](./serving/helloworld-elixir/README.md), [Haskell](./serving/helloworld-haskell/README.md), [Rust](./serving/helloworld-rust/README.md), [Shell](./serving/helloworld-shell/README.md), [Swift](./serving/helloworld-swift/README.md), [Vertx](./serving/helloworld-vertx/README.md) |

serving/samples/README.md

@@ -7,7 +7,7 @@ more about Knative Serving resources.
 
 | Name                       | Description                                                                                                                                                                                                              |                                                                                                                                                                                                                            Languages                                                                                                                                                                                                                             |
 | -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
-| Hello World                | A quick introduction that highlights how to deploy an app using Knative Serving.                                                                                                                                         | [C#](helloworld-csharp/README.md), [Clojure](helloworld-clojure/README.md), [Eclipse Vert.x](helloworld-vertx/README.md), [Haskell](helloworld-haskell/README.md), [Go](helloworld-go/README.md), [Java](helloworld-java/README.md), [Kotlin](helloworld-kotlin/README.md), [Node.js](helloworld-nodejs/README.md), [PHP](helloworld-php/README.md), [Python](helloworld-python/README.md), [Ruby](helloworld-ruby/README.md), [Rust](helloworld-rust/README.md) |
+| Hello World                | A quick introduction that highlights how to deploy an app using Knative Serving.                                                                                                                                         | [C#](helloworld-csharp/README.md), [Go](helloworld-go/README.md), [Java](helloworld-java/README.md), [Kotlin](helloworld-kotlin/README.md), [Node.js](helloworld-nodejs/README.md), [PHP](helloworld-php/README.md), [Python](helloworld-python/README.md), [Ruby](helloworld-ruby/README.md) |
 | Advanced Deployment        | Simple blue/green-like application deployment pattern illustrating the process of updating a live application without dropping any traffic.                                                                              |                                                                                                                                                                                                                 [YAML](blue-green-deployment.md)                                                                                                                                                                                                                 |
 | Autoscale                  | A demonstration of the autoscaling capabilities of Knative.                                                                                                                                                              |                                                                                                                                                                                                                   [Go](autoscale-go/README.md)                                                                                                                                                                                                                   |
 | Private Repo Build         | An example of deploying a Knative Serving Service using a Github deploy-key and a DockerHub image pull secret.                                                                                                           |                                                                                                                                                                                                              [Go](build-private-repo-go/README.md)                                                                                                                                                                                                               |