added recursion questions

[okaditya84]

Please check all that apply.

This PR is for:

• Algorithm
• Cheatsheet
• Resource
• Other

Title for the Algorithm/Cheat-Sheet/Resource: [Recursion]

Programming Language: [c++]

• Have you implemented it on your local machine or any online compiler?
• There is the main( ) function to run the program and all the inputs which are being taken are clearly printed on the console or well commented in the file.
• Filename is self-explanatory or there is Readme.md file explaining the necessary details of the algorithm.

P.S. Failing to update the PR in 10 days on requested changes will be marked outdated and closed.

[okaditya84]

I have added some basic recursion questions implemented in C++ which will help one understand the concepts of recursion easily and in a structured way

[starkblaze01]

@okaditya84 , We already have Factorial in cpp so you can remove that, rest looks good but please remove the .exe files from your commit, and you have pushed in changes in the Python folder change the path to cpp folder