docs: adding contribution guidelines (devfile#823)

* docs: adding contribution guidelines

Signed-off-by: Michael Hoang <mhoang@redhat.com>

* triggering ci workflow

Signed-off-by: Michael Hoang <mhoang@redhat.com>

CONTRIBUTING.md

@@ -0,0 +1,56 @@
+# Contributing
+
+Contributions are welcome!
+
+## Code of Conduct
+
+Before contributing to this repository for the first time, please review our project's [Code of Conduct](https://github.com/devfile/api/blob/main/CODE_OF_CONDUCT.md).
+
+## Getting Started
+
+### Issues
+
+- Open or search for [issues](https://github.com/devfile/api/issues) with the label `area/api`.
+
+- If a related issue doesn't exist, you can open a new issue using a relevant [issue form](https://github.com/devfile/api/issues/new/choose). You can tag issues with `/area api`.
+
+### Building
+
+To build the CRD and the various schemas, you don't need to install any pre-requisite apart from `docker`.
+In the root directory, just run the following command:
+
+```
+./docker-run.sh ./build.sh
+```
+
+### Testing
+
+Find more information about tests in the [testing document](test/README.md).
+
+```
+# schemaTest approach
+cd test/v200/schemaTest
+go test -v
+```
+
+```
+# apiTest approach
+cd test/v200/apiTest
+go test -v
+```
+
+### Pull Requests
+
+All commits must be signed off with the footer:
+
+```
+Signed-off-by: First Lastname <email@email.com>
+```
+
+Once you set your user.name and user.email in your git config, you can sign your commit automatically with git commit -s. When you think the code is ready for review, create a pull request and link the issue associated with it.
+
+Owners of the repository will watch out for and review new PRs.
+
+If comments have been given in a review, they have to be addressed before merging.
+
+After addressing review comments, don’t forget to add a comment in the PR afterward, so everyone gets notified by Github and knows to re-review.

README.md

@@ -63,3 +63,11 @@ As soon as the devworkspace is opened, you should be able to:
   - `samples/`
   - `devfile-support/samples`
 - have `yaml` language support (completion and documentation) based on the current Json schemas.
+
+## Contributing
+
+Please see our [contributing.md](./CONTRIBUTING.md).
+
+## License
+
+Apache License 2.0, see [LICENSE](./LICENSE) for details.