Add an official image for Rapidoid (#705)

* Added documentation for the Rapidoid image.
* Shorter description.
* Replaced the "ADD" command with "COPY".
* Referencing the MySQL container by name, instead of ID.
* New logo for Rapidoid.

rapidoid/README-short.txt

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+Rapidoid is a high-performance HTTP server and modern Java web framework / application container.

rapidoid/content.md

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+# What is Rapidoid?
+
+Rapidoid is an extremely fast HTTP server and modern Java web framework / application container, with a strong focus on high productivity and high performance.
+
+> [www.rapidoid.org](http://www.rapidoid.org)
+
+%%LOGO%%
+
+# How to use this image
+
+To quickly start Rapidoid and display some basic usage help, run:
+
+```console
+$ docker run --rm %%REPO%% --help
+```
+
+Rapidoid can be used in different ways:
+
+-	as a web tool, to quickly prototype RESTful web services from the command line
+-	as a HTTP server, to serve static resources
+-	as a Java web application framework/container, to deploy a web application JAR
+
+## Quickly prototyping SQL-powered RESTful web services
+
+To quickly prototype SQL-powered RESTful web services from the command line, you need to link the database container to the Rapidoid container. The MySQL containers should be linked under name `mysql`, and PostgreSQL containers under name `postgres`.
+
+This example starts a new MySQL container and links it under name `mysql` in the Rapidoid container, where a RESTful service is defined by specifying SQL query for the route `GET /users`. The service returns the result (a list of MySQL users) in JSON format.
+
+```console
+docker run -d --name some-mysql -e MYSQL_ROOT_PASSWORD=db-pass mysql
+
+docker run -it --rm \
+    -p 8888:8888 \
+    --link some-mysql:mysql \
+    %%REPO%% \
+    profiles=mysql \
+    jdbc.password=db-pass \
+    '/users <= SELECT user FROM mysql.user'
+```
+
+**Note:** Please wait for several seconds for the MySQL database to initialize, and then you can visit [http://localhost:8888/users](http://localhost:8888/users) (or `http://your-host:8888/users`) in your web browser.
+
+**Syntax for the service prototyping arguments**:
+
+```console
+'[GET|POST|PUT|DELETE|PATCH] <uri> <= <sql>'
+```
+
+## Serving static files
+
+Rapidoid will automatically serve static files from the folders: `/app/static` (or `/app/public`, which is deprecated). To serve the contents of the `/your-www-root` directory, please mount it as `/app/static`:
+
+```console
+$ docker run -it --rm \
+    -p 8888:8888 \
+    -v /your-www-root:/app/static \
+    %%REPO%%
+```
+
+## Configuration
+
+Rapidoid will try to read the configuration from `/app/config.yml`. The configuration can also be specified with command-line arguments or environment variables.
+
+To configure a custom port (by default `8888`) for the default and the Admin server, run the following command. If `admin.port` is not configured, the default server is also used as Admin server, so only one port will be opened (`on.port`).
+
+```console
+$ docker run -it --rm \
+    -p 4444:4444 \
+    -p 9999:9999 \
+    %%REPO%% \
+    on.port=4444 \
+    admin.port=9999 \
+    app.services=ping \
+    admin.services=status
+```
+
+Then you can visit [http://localhost:4444/\_ping](http://localhost:4444/_ping) (or `http://your-host:4444/_ping`) and [http://localhost:9999/\_status](http://localhost:9999/_status) (or `http://your-host:9999/_status`) in your web browser.
+
+The same setup can be configured with environment variables:
+
+```console
+$ docker run -it --rm \
+    -p 4444:4444 \
+    -p 9999:9999 \
+    -e ON_PORT=4444 \
+    -e ADMIN_PORT=9999 \
+    %%REPO%% \
+    app.services=ping \
+    admin.services=status
+```
+
+For more details, please see the [full list of configuration options and their default values](http://www.rapidoid.org/the-default-configuration.html).
+
+## Security
+
+Rapidoid's HMAC-based security token mechanism requires all containers to share the same secret key when scaling out a web application:
+
+```console
+$ docker run -it --rm \
+    -p 8888:8888 \
+    -e SECRET=your-secret-key \
+    %%REPO%%
+```
+
+While this is an easy way to get started, for security reasons it is recommended to store the secret key in the `/app/config.yml` file, with proper permissions.
+
+**Note:** For production use, you must replace `your-secret-key` with a real, private secret key.
+
+**Note:** If no secret key is specified, a random secret key will be generated, which is acceptable when deploying a single container.
+
+## Full bootstrap of Rapidoid's Admin Center
+
+To bootstrap a full-blown Admin Center in Rapidoid, you will also need to configure a password for the built-in `admin` user:
+
+```console
+$ docker run -d \
+    --restart=always \
+    -p 8888:8888 \
+    -e SECRET=your-secret-key \
+    -e USERS_ADMIN_PASSWORD=admin-pass \
+    %%REPO%% \
+    admin.services=center
+```
+
+Please replace `admin-pass` with a real password for the `admin` user. Then you can login to the Admin Center by visiting [http://localhost:8888/\_](http://localhost:8888/_) (or `http://your-host:8888/_`) in your web browser.
+
+**Note:** For production use, you must replace `your-secret-key` with a real, private secret key (please see the `Security` section).
+
+# How to extend this image (application JAR deployment)
+
+To use this image as base image for your web application, simply add your application JAR as `/app/app.jar`:
+
+```dockerfile
+COPY <location/of/your/webapp.jar> /app/app.jar
+```

rapidoid/github-repo

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+https://github.com/rapidoid/docker-rapidoid

rapidoid/license.md

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+View [license information](https://www.apache.org/licenses/LICENSE-2.0) for the software contained in this image.