Added license and contribution guideline

CONTRIBUTING.md

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+# Contributions Guidelines
+
+Before submitting pull request please :
+
+- Search previous suggestions before making a new one, as yours may be a duplicate.
+- Make sure the list is useful before submitting. That implies it has enough content and every item has a good succinct description.
+- Make an individual pull request for each suggestion.
+- Use [title-casing](http://titlecapitalization.com) (AP style). 
+- Use the following format: `[List Name](link)`
+- Link additions should be added to the bottom of the relevant category.
+- New categories or improvements to the existing categorization are welcome.
+- Check your spelling and grammar.
+- Make sure your text editor is set to remove trailing whitespace.
+- The pull request and commit should have a useful title.
+- The body of your commit message should contain a link to the repository.
+- Check that it's not already in the list 
+- Make sure that it's not an outdated resource that is no longer useful
+- It doesn't link to an illegal source, like a book that is illegaly distributed 
+- **Finally** please remember that every link and contribution no matter how small it is , is highly appreciated and encouraged as it helps gather all the resources in one place.

LICENSE.md

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+
+    Copyright (C) 2015 Kiloreux <[email protected]>
+
+    THE LIST IS PROVIDED "AS IS" WITHOUT ANY WARRANTIES.
+
+    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION:
+    1. You just DO WHAT YOU WANT TO.