Write a contributing guidelines file

[tlein]

Formatting

• 4 spaces as tab
• TypeScript type colons hug the identifier, not the type
• Open curly brackets are on the same line
• Must always use curly brackets around if/while/for/etc...
• All private members (variables, functions, get/set) must begin with an underscore (_)
• Variables and functions are camelCase
• const variable names are SCREAMING_CASE
• Must pass all linter formatting checks

Writing Issues

• Describe what is the problem
• Provide a relevant sample code demonstrating the problem if necessary

Opening Pull Requests

• Unit test all new functionality
• E2E test when appropriate
• Follow PR description format as they are used as the squash commit for the PR