Create README.md

Author: bharathikannann

Trees/BinaryTree/README.md

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+## `Available methods in BT.java`
+- void insert(int data)
+- void inorder()
+- void preorder()
+- void postorder()
+- int sum()
+- int getDiffEvenOddNodes()
+- int noOfNodes()
+- int noOfLeadNodes()
+- int height()
+- void levelOrderTraversal()
+- void printAtGivenLevel(int level)
+- void reverseLevelOrderTraversal()
+- void levelOrderTraversallinebyline()