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+Contribution Guidelines
+====
+
+Add books with this format :
+
+
+```
+###[BOOK NAME](BOOK URL) 
+
+<img src="BOOK COVER IMAGE ADDRESS" width="120px"/>
+
+BOOK DESCRIPTION
+
+```
+
+* If book is free, add it after free books of that category and also add `*Free*` after book url.
+* Add other books at the end of the list in that category