Created basic backend structure, auth and CRUD endpoints.

core/exceptions.py

@@ -0,0 +1,19 @@
+from fastapi import HTTPException
+
+
+class ObjectNotFoundInDB(Exception):
+    def __init__(self, *args):
+        super().__init__(*args)
+
+
+class UserNotFound(HTTPException):
+    def __init__(
+        self,
+        status_code=404,
+        detail={
+            "message": "Didn't find a user with the provided id.",
+            "code": "user-not-found",
+        },
+        headers=None,
+    ):
+        super().__init__(status_code, detail, headers)