Add README

[FireIsGood]

READMEs are helpful for initially viewing the project on the web, especially to get information on how to contribute and what the aims for the project are.

As a basic recommendation:

• Basic description (currently there's only the repository description)
• Contribution instructions (feel free to copy my installation directions section as this is an Astro project)
• Contribution guidelines (what types of pull requests; e.g. posts (probably not) versus style or semantics (probably?) are desired)