Manim current status and contribution guidelines

Hello everyone, I will explain the current status of manim in this issue.

Now there are three main manim versions, and their differences:

1. The master branch of 3b1b/manim: Rendering on GPU using OpenGL and moderngl. Support interaction and have higher efficiency.
2. ManimCommunity/manim: (@ManimCommunity is being improved and will be released on pypi) Using multiple backend rendering. There is better documentation and a more open contribution community.
3. The cairo-backend branch of 3b1b/manim: Rendering on the CPU using cairo. Relatively stable, no longer be developed.

If you want to contribute to manim:

• The master branch of 3b1b/manim: See https://3b1b.github.io/manim/development/contributing.html
• ManimCommunity/manim accepts a wider range of new features and pull requests.
• manim-kindergarten/manim_sandbox has a lot of new common classes in the utils/ folder, and accepts pull requests.

Lastly, thank you very much for using manim and willing to contribute. Enjoy yourself !