Addition in Math folder of topic "Babylonian method for square root"

[Anmolreshi]

I am having the source code and i think implementing it into this would be of great help to others , let me know if you want this contribution into your source code.

[mishraabhinn]

Go Ahead.

[Anmolreshi]

#851 Adding it

[kvedala]

This was implemented in #852 but was marked closed due to 365 unrelated file changes in the pull-request.
hence closing this issue.
Can be reopened if the author would like to create a new pull-request with changes rebased from the new master branch.