✨ Adding the PinDTO (for the patch route)

app/dto/PinDTO.py

@@ -0,0 +1,5 @@
+from pydantic import BaseModel
+
+class PinDTO(BaseModel):
+    title: str
+    description: str

app/dto/__init__.py

@@ -1,4 +1,5 @@
 from .UserRegisterDTO import UserRegisterDTO
 from .FriendAddDTO import FriendAddDTO
 from .FriendListDTO import FriendListDTO
-from .UserDTO import UserDTO
+from .UserDTO import UserDTO
+from .PinDTO import PinDTO