Add apistar framework to web-framework section

[OfirArbel]

What is this Python project?

A new python web framework project, designed for Python 3.

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

• API documentation - Interactive API documentation, that's guaranteed to always be in sync with your codebase.
• Client libraries - JavaScript and Python client libraries, driven by the typesystems that API Star generates.
• Schema generation - Support for generating Swagger or RAML API typesystems.
• Expressive - Type annotated views, that make for expressive, testable code.
• Performance - Dynamic behaviour for determining how to run each view makes API Star incredibly efficient.
• Throughput - Support for asyncio to allow for building high-throughput non-blocking applications.

--

Anyone who agrees with this pull request could vote for it by adding a 👍 to it, and usually, the maintainer will merge it when votes reach 20.

[vinta]

apistar is already on the list.
See https://github.com/vinta/awesome-python#restful-api