Added instructions on including sources. Improved formatting.

Author: Karan Goel

CONTRIBUTING.md

@@ -5,24 +5,29 @@ How to Contribute
 
 Please **do not send pull requests for replacing my code**. If you'd like to contribute solutions, please see the following instructions:
 
-* Solve the problem, and keep it in your repo. DO NOT send merge request yet.
-* Find the problem in this [README](https://github.com/thekarangoel/Projects/blob/master/README.md) file.
-* Edit the file in this format (notice the double square brackets):
+- Solve the problem, and keep it in your repo. DO NOT send merge request yet.
 
-    **This is a problem** - And here goes it's description. \[[octocat]]\(link-to-octocats-solution) \[[you]]\(link-to-your-solution)
+- Find the problem in this [README](https://github.com/thekarangoel/Projects/blob/master/README.md) file.
+
+- Edit the file in this format (notice the double square brackets):
+
+    \**This is a problem** - And here goes it's description. \[[octocat]]\(link-to-octocats-solution) \[[your_username]]\(link-to-your-solution)
 
-This results in something like this:
+    This results in something like this:
+    
+    **This is a problem** - And here goes it's description. [[octocat]](link-to-octocats-solution) [[your_username]](link-to-your-solution)
 
-**This is a problem** - And here goes it's description. [[octocat]](link-to-octocats-solution) [[you]](link-to-your-solution)
+- Please respect other people and do not delete or move anyone else's link. Place your solution at the end of the list of solutions.
 
-* Please respect other people and do not delete or move anyone else's link. Place your solution at the end of the list of solutions.
-* Save/Commit the README.md file.
-* Send a pull request for this commit ONLY!
+- Save/Commit the README.md file.
+- Send a pull request for this commit ONLY!
 
 =====================================
 
-## Problems
+## Projects
+
+If you have suggestions for adding or removing projects, feel free to [open an issue](https://github.com/thekarangoel/Projects/issues/new) to discuss it, or directly create a pull request after you edit the *README.md* file with necessary changes. If you add a problem, make sure you add it in the correct category.
 
-If you have suggestions for adding or removing problems, feel free to [open an issue](https://github.com/thekarangoel/Projects/issues/new) to discuss it, or directly create a pull request after you edit the *README.md* file with necessary changes. If you add a problem, make sure you add it in the correct category.
+It is required that any changes made to the projects (this does not include adding solutions) in *README.md*, must be reflected in *README-scratch.md* and in *README.md* file in the relevant category folder. If you're copying a project from some other webpage, you **MUST** link to it in the *Sources* section at the bottom of repo's *README.md* and *README-scratch.md*.
 
-It is required that any changes made to the problems (this does not include adding solutions) in *README.md*, must be reflected in *README-scratch.md* and in *README.md* file in the relevant category folder. If you skip this step, I will not merge the changes!
+If you skip any step(s), I will not merge the changes!