OpenSource : 5.25 Explain everything related to `TiKV`

[Aryamanz29]

Description :

• Explain everything related to TiKV

  Note :

• Changes should be made inside the Open_Source/ directory & Opensource branch.

• Put your doc inside section-5

• Issue only for GWOC'21 contributors.

• Issue will be assigned on a first come first serve basis, 1 Issue == 1 PR == 1 Contributor

• For Contributor please don't create the same issue again, before creating any issue do visit OpenSource Milestone

• Doc name should same as the issue title

Must Follow : Contributing Guidelines & Code of Conduct before start Contributing.

Happy Contributing 🙌

[s4marth]

I would like to work on this. batch 3 (opensource)

[Aryamanz29]

@s4marth Assigning this to you, Happy learning 🎉🎉