[ACA-1218] contributing guide (#270)

* contributing guide

* Update CONTRIBUTING.md
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# Contributing to Alfresco Content Application (ACA)
We would love for you to contribute to Alfresco Content Application and help make it ever better!
As a contributor, here are the guidelines we would like you to follow:
* [Code of Conduct](#coc)
* [Question or Problem?](#question)
* [Issues and Bugs](#issue)
* [Feature Requests](#feature)
* [Submission Guidelines](#submit)
* [Coding Rules](#rules)
* [Signing the CLA](#cla)
## <a name="coc"></a> Code of Conduct
Help us keep Alfresco Content Application open and inclusive.
Please read and follow our [Code of Conduct][coc].
## <a name="question"></a> Got a Question or Problem?
Do not open issues for general support questions as we want to keep GitHub issues for bug reports and feature requests.
You've got much better chances of getting your question answered on [Gitter][gitter].
The ADF [Gitter][gitter] channel is a much better place to ask questions since:
* many people that can help
* questions and answers stay available for public viewing so your question / answer might help someone else
* all discussions are saved and indexed, you can search for previous answers
## <a name="issue"></a> Found a Bug?
If you find a bug in the source code, you can help us by:
* [submitting an issue](#submit-issue) to our [ACA JIRA project][jira]
* [submitting an issue](#submit-issue) to our [GitHub Repository][github].
Even better, you can [submit a Pull Request](#submit-pr) with a fix.
## <a name="feature"></a> Missing a Feature?
You can *request* a new feature by [submitting an issue](#submit-issue)
to our [JIRA project][jira] or GitHub Repository.
If you would like to *implement* a new feature, please submit an issue with a proposal for your work first,
to be sure that we can use it.
Please consider what kind of change it is:
* For a **Major Feature**, first open an issue and outline your proposal so that it can be
discussed. This will also allow us to better coordinate our efforts, prevent duplication of work,
and help you to craft the change so that it is successfully accepted into the project.
* **Small Features** can be crafted and directly [submitted as a Pull Request](#submit-pr).
## <a name="submit"></a> Submission Guidelines
Before you submit an issue, please search the issue tracker, maybe an issue for your problem already exists
and the discussion might inform you of workarounds readily available.
We want to fix all the issues as soon as possible, but before fixing a bug we need to reproduce and confirm it.
In order to reproduce bugs, we will systematically ask you to provide a minimal reproduction scenario.
Having a reproducible scenario gives us a wealth of important information without going back & forth to you with additional questions like:
* version of node.js used
* version of NPM used
* version of Angular used
* versions of ADF libraries used
* 3rd-party libraries and their versions
* and most importantly - a use-case that fails
You can file new issues by filling out our [new issue form](https://github.com/Alfresco/alfresco-content-app/issues/new).
### <a name="submit-pr"></a> Submitting a Pull Request (PR)
Before you submit your Pull Request (PR) consider the following guidelines:
1. Search [GitHub](https://github.com/Alfresco/alfresco-content-app/pulls) for an open or closed PR
that relates to your submission. You don't want to duplicate effort.
1. Please sign our [Contributor License Agreement (CLA)](#cla) before sending PRs.
We cannot accept code without this.
Make sure you sign with the primary email address of the Git identity that has been granted access to the Angular repository.
1. Fork the ACA repository.
1. Make your changes in a new git branch based on **development**:
```shell
git checkout -b my-fix-branch development
```
1. Create your patch, **including appropriate test cases**.
1. Follow our [Coding Rules](#rules).
1. Run the full ACA test suite and ensure that all tests pass.
1. Commit your changes using a descriptive commit message.
1. Push your branch to GitHub:
```shell
git push origin my-fix-branch
```
1. In GitHub, send a pull request to `alfresco-content-app:development`.
* If we suggest changes then:
* Make the required updates.
* Re-run the ACA test suites to ensure tests are still passing.
* Rebase your branch and force push to your GitHub repository (this will update your Pull Request):
```shell
git rebase development -i
git push -f
```
That's it! Thank you for your contribution!
## <a name="rules"></a> Coding Rules
To ensure consistency throughout the source code, keep these rules in mind as you are working:
* All features or bug fixes **must be tested** by one or more specs (unit-tests).
* All public API methods **must be documented**.
## <a name="cla"></a> Signing the CLA
Please sign our [Contributor License Agreement (CLA)][cla] before sending pull requests.
In addition, you will get the CLA link automatically generated for your first pull request.
For any code changes to be accepted, the CLA must be signed.
It's a quick process, we promise!
<hr>
If you have more than one Git identity, you must make sure that you sign the CLA using the primary
email address associated with the ID that has been granted access to the Angular repository.
Git identities can be associated with more than one email address, and only one is primary.
Here are some links to help you sort out multiple Git identities and email addresses:
* https://help.github.com/articles/setting-your-commit-email-address-in-git/
* https://stackoverflow.com/questions/37245303/what-does-usera-committed-with-userb-13-days-ago-on-github-mean
* https://help.github.com/articles/about-commit-email-addresses/
* https://help.github.com/articles/blocking-command-line-pushes-that-expose-your-personal-email-address/
Note that if you have more than one Git identity, it is important to verify that you are logged in
with the same ID with which you signed the CLA, before you commit changes. If not, your PR will fail the CLA check.
<hr>
[coc]: https://github.com/Alfresco/alfresco-content-app/blob/master/CODE_OF_CONDUCT.md
[github]: https://github.com/Alfresco/alfresco-content-app
[gitter]: https://gitter.im/Alfresco/alfresco-ng2-components
[jira]: https://issues.alfresco.com/jira/projects/ACA
[cla]: https://cla-assistant.io/Alfresco/alfresco-content-app