hi:this is not a issue but a offer for support or donation of a rocket chat server and/or support, i have seen some requests and frustrations dealing with RC,if you have a urgent need or compelling reason reach out for some assistance we may be able to help 
Hello My self Chandra Pratap I am here from the willingness to learn about Rocket chat Is Here Someone Who Can help Me for this Am Thanking Full For them Thanking You
The code base is big and will take a while to get to grips with. You are going to have to do a lot of reading and learning yourself.
Read the dev docs:
https://developer.rocket.chat
Check out:
https://open.rocket.chat/channel/Code-walk-through-and-architecture
See the link down here on how to attract the attention of developers.
Particularly this - Ask smart questions.