Description

Added files for "File Encryption and Decryption" in the python directory of the repository. Fixes issue : #1257

Type of change

[X] My code follows the style guidelines(Clean Code) of this project
[X] I have performed a self-review of my own code
[X] I have commented my code, particularly in hard-to-understand areas
[X] I have created a helpful and easy to understand README.md
[X] I have made corresponding changes to the documentation
[X] My changes generate no new warnings
[X] I have added tests/screenshots(if any) that prove my fix is effective or that my feature works