Add pointers when adding a new hook

src/pre_commit_hooks/README.md

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+# Adding new hooks
+
+This repository can be used for adding new pre-commit hooks, mostly 
+that are related to functionality offered by the LINCC Frameworks
+Python Project Template.
+
+## Checklist
+
+* Write tests for your new hook
+* Implement the hook logic in a new module in this directory
+* Make sure that the module contains a `if __name__ == "__main__":` kinda thing
+* Include the module in the `./src/__init__.py` file
+* Add an entry in the `./.pre-commit-hooks.yaml` file
+* Add an entry to `./pyproject.toml` in the `[project.scripts]` section
+* Add documentation on the main README to explain 
+    * the purpose of the hook
+    * how to add the hook to your project
+    * what pre-commit success looks like 
+    * what pre-commit failures look like