Create README and add linting scripts with mocha tests for linting (#17)

[TickedOffCodess]

• Update eslint config file

• Add test for linting each file

• Lint app & companion files

• Add README and TODO files, update package.json to reflect tests and linting

• Fix eslint to remove space after named function

• Add package-lock.json to repo

• Update README and TODO

• Add contributing, codebase structure, & coding guidelines documents