add README to graph (#1211)

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

graph/settings.py

@@ -19,6 +19,7 @@ import os
 from api.utils.file_utils import get_project_base_directory
 from api.utils.log_utils import LoggerFactory, getLogger
 
+DEBUG = 0
 LoggerFactory.set_directory(
     os.path.join(
         get_project_base_directory(),
@@ -30,4 +31,4 @@ LoggerFactory.LEVEL = 30
 flow_logger = getLogger("flow")
 database_logger = getLogger("database")
 FLOAT_ZERO = 1e-8
-PARAM_MAXDEPTH = 5
+PARAM_MAXDEPTH = 5