Hi pratysin,
GitHub is a Git repository hosting service. It is used for version control and source code management, please refer to the wikipedia article below for further details.
https://en.wikipedia.org/wiki/GitHub
CA API Management currently has repositories for MAS (Mobile App Services) hosted on Github. Further details can be found at the below sites.
CA API Management · GitHub
CA Developers, CA Mobile App Services - CA Technologies
Regards,
Joe