[ISSUE-287] add program to solve CourseSolution problem

[ravi0213]

Issue Id you have worked upon -

287

Briefly explain your program logic -

Approach: Topological Sorting, Cycle Detection Let's try to think of prerequisites pairs as an edge between two nodes in a graph. Now this problem becomes simple, we just need to find out if there is any cycle in a graph or not. If there is no cycle, then we can finish all the courses otherwise the answer is no.

Screenshots(Attach 2 screenshots of your own input and output) -

Attach here

Checklist:

Eg - If your code follow the below guidelines. Kindly change [] to [x]

All the conditions should be fulfilled for considering your code for merging -

• [x] I have mentioned the question as comment in my solution file.
  

• [x] My code follows the guidelines of this project.
  

• [x] I have performed a self-review of my own code.
  

• [x] I have commented my code.
  

• [x] My code gives the correct output.
  

• [x] I confirm that I have not copied the code from anywhere. In case its found that I have copied even after successful merge then I can be banned from the repository and hacktoberfest.
  

• [x] I affirm that I strictly follow contributing guidelines and code of conduct.

[ravi0213]

@SarthakKeshari Could you please review this PR? Thanks