Add placeholder for "Rotate Image" problem

Author: KwonNayeon

rotate-image/KwonNayeon.py

@@ -0,0 +1,15 @@
+"""
+Constraints:
+- n == matrix.length == matrix[i].length
+- 1 <= n <= 20
+- -1000 <= matrix[i][j] <= 1000
+
+Time Complexity: 
+- 
+
+Space Complexity: 
+- 
+
+풀이방법:
+1. 
+"""