add .gitignore file

messenger_app/api/v1/models/message.py

@@ -0,0 +1,6 @@
+from pydantic import BaseModel
+
+class Message(BaseModel):
+    text: str
+    sender_id: int
+    receiver_id: int

messenger_app/api/v1/models/user.py

@@ -0,0 +1,5 @@
+from pydantic import BaseModel
+
+class User(BaseModel):
+    id: int
+    username: str