Update README and Add CONTIBUTING file

[SchoolyB]

This pull request includes the following changes:

• Update README.md with more clear quick start instructions

• Fix typos in README.md

• Create CONTRIBUTING.md

• Move 'Contributing' section of README.md to CONTRIBUTING.md

• Closes #52

[CobbCoding1]

That's awesome, thanks a ton! Much better than I could've done. I appreciate the in-depth changes as well.