Update README.md

Author: LorranSutter

README.md

@@ -19,6 +19,37 @@
 python3 LP_Sudoku.py sudoku_9x9.txt
 ```
 
+Input example
+
+```
+9
+3 0 6 5 0 8 4 0 0
+5 2 0 0 0 0 0 0 0
+0 8 7 0 0 0 0 3 1
+0 0 3 0 1 0 0 8 0
+9 0 0 8 6 3 0 0 5
+0 5 0 0 9 0 6 0 0
+1 3 0 0 0 0 2 5 0
+0 0 0 0 0 0 0 7 4
+0 0 5 2 0 6 3 0 0
+```
+
+Output example
+
+```
+3  1  6  | 5  7  8  | 4  9  2
+5  2  9  | 1  3  4  | 7  6  8
+4  8  7  | 6  2  9  | 5  3  1
+-------------------------------
+2  6  3  | 4  1  5  | 9  8  7
+9  7  4  | 8  6  3  | 1  2  5
+8  5  1  | 7  9  2  | 6  4  3
+-------------------------------
+1  3  8  | 9  4  7  | 2  5  6
+6  9  2  | 3  5  1  | 8  7  4
+7  4  5  | 2  8  6  | 3  1  9
+```
+
 ## :pencil: Dependencies
 
 gurobipy library must be installed.