Create rotate-img.py

Beats 98.7% of solutions in runtime. Uses excess memory as a temp for swapping. Better solution for non inplace but still very fast.

rotate-img.py

@@ -0,0 +1,9 @@
+class Solution:
+    def rotate(self, matrix: List[List[int]]) -> None:
+        """
+        Do not return anything, modify matrix in-place instead.
+        """
+        x = [[matrix[-(j+1)][i] for j in range(len(row))] for i,row in enumerate(matrix)]
+        for i,m in enumerate(x):
+            for j,n in enumerate(m):
+                matrix[i][j] = n