Create determine-matrix-obtainable.py

Determines whether the target matrix is obtainable by some rotation of the original matrix.

determine-matrix-obtainable.py

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+class Solution:
+    def findRotation(self, mat: List[List[int]], target: List[List[int]]) -> bool:
+        for i in range(4):
+            if mat == target:
+                return True
+            mat = self.rotOnce(mat)
+        return False
+
+    def rotOnce(self, matrix: List[List[int]]) -> List[List[int]]:
+        return [[matrix[-(j+1)][i] for j in range(len(row))] for i,row in enumerate(matrix)]