Add Starlette ASGI Framework

[oliversabler]

What is this Python project?

Starlette is a production ready, lightweight and low-complexity HTTP web framework/toolkit. WebSocket support.

• In-process background tasks
• Startup and shutdown events
• CORS, GZip, Static Files, Streaming responses.
• Session and Cookie support.
• Compatible with asyncio and trio backends.
• Great overall performance against independent benchmarks.

What's the difference between this Python project and similar ones?

Starlette is a minimalist ASGI library for writing against basic but powerful Request and Response classes.

• Supports HTTP
• Supports WebSockets

This framework is used by FastAPI already present in the list under RESTful API

--

Anyone who agrees with this pull request could submit an Approve review to it.