Add arithmetic arranger function with initial implementation

Author: hzoscar

main.py

@@ -0,0 +1,5 @@
+def arithmetic_arranger(problems, show_answers=False):
+
+    return problems
+
+print(f'\n{arithmetic_arranger(["32 + 698", "3801 - 2", "45 + 43", "123 + 49"])}')