Added solution

Author: avidLearnerInProgress

find_first_missing_positive.cpp

@@ -0,0 +1,13 @@
+class Solution {
+public:
+    int firstMissingPositive(vector<int>& nums) {
+        
+        int tofind = 1;
+        while(1){   
+            if(find(nums.begin(), nums.end(), tofind) == nums.end())
+                return tofind;
+            tofind++;
+        }
+        return -1;
+    }
+};