feature: door basic mechanic

- add Door base class

src/door.py

@@ -0,0 +1,13 @@
+import pygame
+
+# using class to be able to reuse it
+# as we will have multiple rooms to go in
+class Door:
+    def __init__(self, x, y, hp_value):
+        # for each door we can set our own x/y position
+        self.x = x
+        self.y = y
+
+        self.max_hp = hp_value
+        self.current_hp = hp_value
+        self.is_closed = False