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Update README.md
Making problems more practical.

Will change some problems around, and remove some and add some, to make this repo more practical and achievable.
Update README-scratch.md
Update README.md
Create CONTRIBUTING.md

On popular demand!
Added ways of contributing!
Now contains only the problems, no blurb!
Describe contributions further!
Added instructions on including sources. Improved formatting.
Count words done
Add link to count_words.py
Merge pull request #1 from thekarangoel/master

Getting latest code.