Added description for the 'crypto_key' field in the GlobalConfig

Author: tieneupin

src/murfey/util/config.py

@@ -508,7 +508,13 @@ class GlobalConfig(BaseModel):
             "instead of creating a new one every time."
         ),
     )
-    crypto_key: str
+    crypto_key: str = Field(
+        default="",
+        description=(
+            "The encryption key used for the SQL database. This can be generated by "
+            "Murfey using the 'murfey.generate_key' command."
+        ),
+    )
 
     # RabbitMQ settings
     feedback_queue: str = "murfey_feedback"