Added Leetcode Reverse Bits solution

Author: Vedant-S

leetcode/cpp/Array/190.cpp

@@ -0,0 +1,13 @@
+class Solution {
+public:
+    uint32_t reverseBits(uint32_t n) {
+        uint32_t res = 0;
+        uint32_t mask = 1;
+        for (int i=0;i<32;i++){
+            if (n&mask) res = res + 1;
+            if (i!=31) res <<= 1;
+            mask <<= 1;
+        }
+        return res;
+    }
+};