Enhancement/husky for auto lint on commit

[Jamesllllllllll]

What issue is this solving?

Closes #15

Description

• Adds Husky & Lint-Staged for linting & formatting on commit.
• Using --fix with ES Lint and --write with Prettier to fix lint errors (if possible) and formatting, respectively.

Notes

✔️ Run npm i to install Husky and Lint-Staged

Linting or formatting error messages may not be developer-friendly

Solution: Added CONTRIBUTING.md to describe how staged files are checked for linting and formatting errors, and to look for the errors if the commit is blocked.

Here is how it appears to me using VS Code on Windows. I tested a commit with a lint error and get this popup:

Click "Open Git Log":

This may be a hurdle for some newbie devs. Since there may not be a one-size-fits-all solution, the documentation in CONTRIBUTING.md will help devs understand pre-commit checks.

Please make sure you've attempted to meet the following coding standards

• Code has been tested and does not produce errors
• Code is readable and formatted
• There isn't any unnecessary commented-out code

[aedwardg]

LGTM. If we run into too many people struggling with it, we can always change over to a pre-push hook instead.