docs(README): Add description about PR checks

Reported with PR comments there: #228

Change-Id: Id0ae60e226456818ff9a5421f839eeb287de4f63
Signed-off-by: Florent BENOIT <fbenoit@redhat.com>

README.md

@@ -381,3 +381,25 @@ Package the binary
 yarn pack
 pkg . -t node10-linux-x64,node10-macos-x64,node10-win-x64 --out-path ./bin/
 ```
+
+## Providing Pull Request
+`chectl` is using several Pull Request checks
+ - [Conventional Commits](https://conventionalcommits.org) convention for the commit messages.
+There is a required Pull Request check named `Semantic Pull Request` that is ensuring that all commits messages are correctly setup. In order to merge a Pull Request, it has to be green.
+
+- Signed Commits. Each commit needs to have the `Signed-off` part
+It needs to be added on the commit message:
+```
+feat(hello): This is my first commit message
+
+Signed-off-by: John Doe <chectl@eclipse.org>
+```
+
+Git even has a -s command line option to append this automatically to your commit message:
+```
+$ git commit -s -m 'feat(hello): This is my first commit message'
+```
+
+- Unit tests with Travis-CI. It will ensure that `yarn test` command is passing.
+
+All these checks are mandatory in order to have the Pull Request merged.