Tests and source for Sorting sub-section

[Diptonil]

The following features need to be worked on:

• Write tests for all the presently available sorting methods (and nothing else in this issue) using JUnit5. An example of the same has been given for Bozo Sort in BozoSortTest.java.
• MergeSort.java & InsertionSort.java should be complete.
• Add BogoSort.java and BogoSortTest.java. Do not add any other sorting methods.
• Adhere to the coding conventions, style-guide and the rule of verbosity of variable names.
• Include the documentation for Merge Sort, Bogo Sort, Bozo Sort, Insertion Sort, Bubble Sort, in-place sorting, stable sorting and Quick Sort in the README.md of the sorting source folder. Refer to the preexisting note on Selection Sort for the process.
• Update README files in both the test directories. Refer to the existing README to understand how it is done.