Added pull request template and updated documentation to point out gi…

…t stage is needed for pre-commit to work.

.github/pull_request_template.md

@@ -0,0 +1,22 @@
+### General:
+
+* [ ] Have you followed the guidelines in our Contributing document?
+* [ ] Have all checks, quality assurance steps and tests passed?
+
+### Quality checks:
+
+* [ ] Have you updates the **CHANGELOG.rst** file?
+* [ ] Have you updated the `version` and `author` attributes (as appropriate) in the **pyproject.toml** file?
+
+### Community standards:
+
+* [ ] Have you followed [Semantic Versioning](https://semver.org)?
+* [ ] Have you updated the **docstrings** and / or **documentation** files to reflect your change?
+
+### What is the purpose of this change?
+
+The purpose of this change is to...
+
+### What does the change consist of?
+
+This change consists of...

CONTRIBUTING.md

@@ -9,7 +9,7 @@ feel free to create one.
 
 ## Development environment
 
-Begin by collecting the repo from github.
+Begin by collecting the repo from [GitHub](https://github.com/ESGF/esgf-playground-utils).
 
 To contribute, you should be using `poetry` as your python package
 manager, see <https://python-poetry.org> for installation instructions.
@@ -54,6 +54,7 @@ You can also (and are encouraged to) run the `pre-commit hooks` manually
 as often as you like with:
 
 ``` shell
+foo@bar:~$ git stage -A
 foo@bar:~$ poetry run pre-commit run -a
 ```