Add 1304_Find_N_Unique_Integers_Sum_up_to_Zero (qiyuangong#16)

* Add 1304_Find_N_Unique_Integers_Sum_up_to_Zero Python Solution, by @Mansi2814

Author: Mansi2814

python/1304_Find_N_Unique_Integers_Sum_up_to_Zero

@@ -0,0 +1,11 @@
+class Solution:
+    def sumZero(self, n: int) -> List[int]:
+        sum = 0
+        list = []
+         
+        for i in range(1,n):
+            list.append(i)
+            sum = sum +i
+        list.append(-sum)
+        return list
+