add module manual_games.py

Author: annetmyshkina

brain_games/games/manual_games.py

@@ -0,0 +1,10 @@
+
+def game_instruction(number_game):
+    if number_game == 1:
+        return 'Answer "yes" if the number is even, otherwise answer "no".'
+    elif number_game == 2:
+        return "What is the result of the expression?"
+    elif number_game == 3:
+        return 'Find the greatest common divisor of given numbers.'
+    else:
+        return "There is no such number. Let's try again!"