LFU to be implemented in Java

[sbshah97]

• Kindly assign this Issue to @Hrily and @salman-bhai.
• Will send a PR in a maximum of two weeks!
• Also if possible can a CONTRIBUTING.md file be made?

[chinmaydd]

Sounds good. I will try adding some contributing guidelines soon. Although, I am not really sure what you are looking for. The README does contain instructions on how to go about implementing. As for contributions is concerned, if your implementation is in a language X make sure to create a branch for X and push to it.

[sbshah97]

Yeah, also if possible can you and @mohitreddy1996 push your code from the forked repository to the main repository!

[mohitreddy1996]

A little bit of code refactoring to be done. Will push the code to the mail repository once done.

[chinmaydd]

your code from the forked repository

It's still a bit incomplete 😢 Will upload once I am done.

[mohitreddy1996]

Test cases added. C++ Code added with appropriate test cases using CppUnit added on branch C++.