Resuming work on the repository

[k1ngmang]

1. Folders have been removed according to the rules described in README:

• While making a PR, make sure you are committing the Kotlin files only and not any project specific files. If you feel that your IDE is generating some extra files, then either don't add them to git, or add the extensions to .gitignore.
• Make sure the algorithm which is getting added comes under a certain domain of Algorithms. Please don't create a package with a name such as Misc, Others, etc.

(Files with code (e.g. palindrome) were moved from the dynamic_programming package to dynamicProgramming)

2. Added comments to files where there were none