Adding ESLINT + Prettier Support

[YosephKS]

In order to increase the readibility of the code, linting and formatting must be incorporated within the development process. The most popular linter in JS is ESLINT and similarly for formatter it is Prettier. To enforce this within the code:

1. Add eslint and prettier to package.json
2. Add a default eslintconfig and prettierconfig file. Additionally, add local .vscode configuration if needed
3. Add all these linting and formatting process in git hooks so that it would be forced when making a new commit

In addition, this will also make PR codes more consistent and easier to review.