Add Implementation of Day 18 question (Frequency Count and Check Power N) in various languages

[MadhavBahl]

Check list:

• [ ] Created a folder with the name of language you code inside /day18/ directory (https://github.com/CodeToExpress/dailycodebase/tree/master/day18)
• [ ] Added your Codes
• [ ] Tested your codes
• [ ] Added credits (author and date) at the top of the code
• [ ] Updated README.md - https://github.com/CodeToExpress/dailycodebase/blob/master/day18/README.md
• [ ] Added yourself as a contributor using all-conributors-cli**