Add support for slither-action

[niket-yende]

This action allows you to run the Slither static analyzer against your project, from within a GitHub Actions workflow.

References:

• slither-action
• slither-analyzer

[niket-yende]

@PatrickAlphaC can we add this github action as an enhancement?

[PatrickAlphaC]

ooo great idea. Yes we should add that!

[niket-yende]

We can also add "hardhat-test" to run the unit test cases while pushing to the main branch.

References:

• hardhat-test
• unit-test-example

FYI @PatrickAlphaC

Waiting for my other PR #48 to be merged. Once that is incorporated, I would be able to raise a separate PR with these changes.

[niket-yende]

@PatrickAlphaC I have raised a PR #50 for this enhancement. Please review it.