Add ReactPy, ServeStatic, and Granian

[Archmonger]

Checklist

• [x] This project is explicitly related to ASGI.
• [x] The new list entry contains a project name, URL and description.

What is this project?

ReactPy - A reactive programming framework for Python, with support for ASGI.

• Do you know about other similar projects?
  • No

Granian - A high performance ASGI server based written in Rust.

• Do you know about other similar projects?
  • All other ASGI webservers

ServeStatic - Production-grade static file server for Python web apps.

• Do you know about other similar projects?
  • WhiteNoise. However, ServeStatic is a fork of WhiteNoise for continued maintenance.

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