Add more problem solutions to existing data structures

[SakshamAgrwl]

Feel free to add new algorithms and code for the data structures given in this repository.
For ex: You can add Moore's voting algorithm in the array's section.

Only add solutions to existing data structures. Don't upload your solution to a new folder as there is a separate issue already available for it.

[anishjain94]

Added Sorting algos #7

[Samridhi-98]

Added section for Linked list

[vibalijoshi]

#54 I made a PR for Moore's voting algorithm, with proper explanations

[skkyal]

Made a PR for Dectection of Loop in Linked List #62