Improve Contributing Docs

[terriann]

While reading an article on Medium, First Timers Only I spotted a couple open source "basics" that I can integrate into this project.

1. How can I use githooks, by way of ghooks or it's replacement, husky to run tests and do linting before commits?
   Mentioned in the medium post
2. Learn more about editorconfig
   Does it make sense to adapt that or does linting take care of that?
3. Are there some best practices commit ideas I can borrow from that repo?
4. How about these issue and pull request templates? .github dir can pre-populate issues field and pull request fields

I think implementing some of these thing will make me a little more open source knowledgeable and open up exposure to some best practices outside of my 9-5.

Resources

• https://github.com/formly-js/angular-formly/blob/master/CONTRIBUTING.md
• https://medium.com/@kentcdodds/first-timers-only-78281ea47455
• https://egghead.io/courses/how-to-write-an-open-source-javascript-library
• http://editorconfig.org/
• https://github.com/typicode/husky

[terriann]

Check out https://github.com/commitizen/cz-cli to help standardize commit messages

It prompts to use this format: https://github.com/conventional-changelog-archived-repos/conventional-changelog-angular/blob/master/convention.md
It's used by the angular-formerly contrib doc