Added Controls testing + documentation

src/myfasthtml/controls/Keyboard.py

@@ -7,6 +7,12 @@ from myfasthtml.core.instances import MultipleInstance
 
 
 class Keyboard(MultipleInstance):
+  """
+  Represents a keyboard with customizable key combinations support.
+
+  The Keyboard class allows managing key combinations and their corresponding
+  actions for a given parent object.
+  """
   def __init__(self, parent, combinations=None, _id=None):
     super().__init__(parent, _id=_id)
     self.combinations = combinations or {}