add simple invite policies

src/matrix_bot/invite_policy.py

@@ -0,0 +1,45 @@
+"""
+    InvitePolicy class:
+        InvitePolicy object are use to chose whether to accept or decline
+        an invite to a room.
+"""
+
+from abc import (
+    ABC,
+    abstractmethod
+)
+import nio
+
+class InvitePolicy(ABC):
+    """
+        Class used by Client to chose whether to accept of decline an invite.
+    """
+
+    @abstractmethod
+    await def accept_invite(
+        self,
+        invite: nio.responses.InviteInfo
+    )->bool:
+        pass
+
+class DeclineAll(InvitePolicy):
+    """
+        Decline all invitations.
+    """
+
+    await def accept_invite(
+        self,
+        invite: nio.responses.InviteInfo
+    )->bool:
+        return False
+
+class AcceptAll(InvitePolicy):
+    """
+        Accept all invitations.
+    """
+
+    await def accept_invite(
+        self,
+        invite: nio.responses.InviteInfo
+    )->bool:
+        return True