Update code-of-conduct, readme and contrib files (#1429)

* update docs

* update docs

* update docs

CONTRIBUTING.md

@@ -0,0 +1,5 @@
+# Contribution guidelines
+
+So you want to hack on Knative Serving? Yay! Please refer to Knative's overall
+[contribution guidelines](https://www.knative.dev/community/contributing/) to
+find out how you can help.

README.md

@@ -44,22 +44,12 @@ extend the `kn` CLI. For more information, have a look at:
 - [User guide](docs/README.md)
   - Installation - How to install `kn` and run on your machine
   - Examples - Use case based examples
-  - FAQ (_to come._)
 - [Reference Manual](docs/cmd/kn.md) - all possible commands and options with
   usage examples
 
+Additionally you can visit [knative.dev](https://knative.dev) for more examples.
+
 ## Developers
 
-We love contributions! Please refer to
+If you are interested in contributing, see [CONTRIBUTING.md](./CONTRIBUTING.md)
-[CONTRIBUTING](https://knative.dev/contributing/) for more information on how to
+and [DEVELOPMENT.md](docs/DEVELOPMENT.md).
-best contributed to contribute to Knative.
-
-For code contributions it as easy as picking an
-[issue](https://github.com/knative/client/issues) (look out for
-"kind/good-first-issue"), briefly comment that you would like to work on it,
-code, test, code and finally submit a
-[PR](https://github.com/knative/client/pulls) which will trigger the review
-process.
-
-More details on how to build and test can be found in the
-[Developer guide](docs/DEVELOPMENT.md).

code-of-conduct.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of
+experience, education, socio-economic status, nationality, personal appearance,
+race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+- Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+- The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+- Trolling, insulting/derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, or to ban temporarily or permanently any
+contributor for other behaviors that they deem inappropriate, threatening,
+offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at
+knative-code-of-conduct@googlegroups.com. All complaints will be reviewed and
+investigated and will result in a response that is deemed necessary and
+appropriate to the circumstances. The project team is obligated to maintain
+confidentiality with regard to the reporter of an incident. Further details of
+specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 1.4, available at
+https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org