133 use GitHub actions and pre commit

[AhmedHathout]

It is probably better to review changes commit by commit rather than all commits in one go.

Changes:-

• Adds the files needed for pre-commit. This will ensure better code quality for the subsequent merge requests (after this one is merged).
• It also configures GitHub Actions to make sure that pre-commit will run even if the contributor forgets too. It will fail if the criteria are not met. Have a look at the forked repo for examples (and also to check that the last push did not fail)
• Added CONTRIBUTING.md to explain how to contribute (and mention how to use pre-commit). File is probably not complete but it covers more than what this PR does
• Added ACKNOWLEDGMENT.md

Closes #133