7 Cipher algorithm in JAVA and a Big Factorial is added.

[Jetty53]

Description

I have added to things 1) A java code for the factorial of very big integers. 2) A cipher folder containing 7 cipher algorithm.

Fixes #(issue number)

Type of change

Please delete options that are not relevant

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] This change requires a documentation update

Checklist:

• [x] I have read the contribution guidelines before making this PR.
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented in my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation (Language folder or any other readme instructed to)
• [ ] My changes generates no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works

[kaustubhgupta]

PR rejected, No issue assigned, Guidelines violated

This was also Spammy PR