Adding marix operations and variation of apply functions in 'r' cheatsheet

[Arun9739]

• I want to add the Various matrix operation and their syntax in the 'R' cheatsheet
• I will also add apply functions such as apply, lapply, sapply and many more functions and their syntax.
• I will follow the contributing guidelines and the code style of the project.

[Arun9739]

@onecompiler-ops plz assign me this issue.

[onecompiler-ops]

assigned!