Selection Sort

[KhafiaAyyub]

Fixes #130

Short description of what this resolves:

What Changes proposed in this pull request:

Added the following points:

• Introduction
• Understanding the selection sort
• Algorithm of selection sort
• implementation + illustration
• code for selection Sort
• Time complexity analysis+stability
• Space complexity
• applications
• selection sort vs bubble sort
• selection sort vs merge sort
• selection sort vs quicksort

Checklist

• [x] Added description of change
• [x] Added file name matches File name guidelines
• [x] Added code examples, test must pass
• [x] Added documentation so that the program is self-explanatory and educational.
• [x] Relevant documentation/comments is changed or added
• [x] PR title follows semantic commit guidelines
• [x] Search previous suggestions before making a new one, as yours may be a duplicate.
• [x] I acknowledge that all my contributions will be made under the project's license.

Notes:

[KhafiaAyyub]

@Utkarsh1504 please review?

[Utkarsh1504]

@KhafiaAyyub you have done it very nicely markdown is great, but all the content is plagiarised from other websites. For now, we're merging this PR but in the future, we need to change it with DSA-JAVA-Bootcamp's notes. Thank you!