Added more custom exceptions and prepared everything for documentation

classes/errors/pycord_event.py

@@ -0,0 +1,20 @@
+from typing import Optional
+
+from bson import ObjectId
+
+
+class EventNotFoundError(Exception):
+    """PycordEvent could not find event with such an ID in the database"""
+
+    def __init__(self, event_id: Optional[str | ObjectId] = None, event_name: Optional[str] = None) -> None:
+        self.event_id = event_id
+        self.event_name = event_name
+
+        if self.event_id is None and self.event_name is None:
+            raise AttributeError("Either event id or name must be provided")
+
+        super().__init__(
+            f"Event with id {self.event_id} was not found"
+            if event_id is not None
+            else f"Event with name {self.event_name} was not found"
+        )