Reason for PR

Basic documentation and other setup things

Changes in this PR

• Adds a .gitignore file
• Adds frontend/yarn.lock to the ignore file
• Adds some basic instructions for setting up the front end locally
• Adds a "how-to" in the docs/ directory for installing Node

Issue (Optional)

Closes (replace with #issueNumber. e.g. Closes #1)

Additional Information

Just trying to help get things off the ground

Pull Request Requirements

• I have thoroughly read and understand The Odin Project Contributing Guide
• The title of this PR follows the location of change: brief description of change format, e.g. Menu.js: Fix link text
• The Reason for PR section summarizes the reason for this PR
• The Changes in this PR section has a bullet point list describing the changes in this PR
• [ ] If this PR addresses an open issue, it is linked in the Issue section