Created terminal_controller and "clear" function

controllers/terminal_controller.py

@@ -0,0 +1,11 @@
+from subprocess import call
+from controllers.system_controller import SystemController
+
+
+class TerminalController:
+    def __init__(self):
+        pass
+
+    @staticmethod
+    def clear():
+        call('clear' if SystemController().is_unix() else 'cls')