add manim

Author: JinyangWang27

README.md

@@ -1096,6 +1096,7 @@ _Libraries for parsing URLs._
 
 _Libraries for manipulating video and GIFs._
 
+- [manim](https://github.com/ManimCommunity/manim) - An animation engine for explanatory math videos.
 - [moviepy](https://zulko.github.io/moviepy/) - A module for script-based movie editing with many formats, including animated GIFs.
 - [scikit-video](https://github.com/aizvorski/scikit-video) - Video processing routines for SciPy.
 - [vidgear](https://github.com/abhiTronix/vidgear) - Most Powerful multi-threaded Video Processing framework.