Added flipping bits solution (hackerrank)

hackerrank/easy-flipping-bits.md

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+Flipping bits (HackerRank)
+===============================
+### Easy
+![Problem Statement](./pdfs/flipping-bits-English.pdf)
+
+Solution
+========
+```python
+#!/bin/python3
+
+import math
+import os
+import random
+import re
+import sys
+
+# Complete the flippingBits function below.
+def flippingBits(n):
+    max_int = 0xFFFFFFFF
+    return max_int - n
+
+if __name__ == '__main__':
+    fptr = open(os.environ['OUTPUT_PATH'], 'w')
+
+    q = int(input())
+
+    for q_itr in range(q):
+        n = int(input())
+
+        result = flippingBits(n)
+
+        fptr.write(str(result) + '\n')
+
+    fptr.close()
+
+```
+