add schemas

Author: petrkalos

README.md

@@ -1,3 +1,23 @@
 # data.all core package
 
-This is a package containing dataall_core modules used in both data.all CLI and SDK.
+This is a package containing dataall_core modules used in both data.all CLI and SDK.
+
+
+# generate schema from a data.all deployments
+
+* Copy and run the following script in `data.all/backend` directory...
+```python
+from dataall.base.loader import load_modules, ImportMode
+from graphql import introspection_from_schema
+from dataall.base.api import get_executable_schema
+import json
+
+load_modules(modes={ImportMode.API})
+SCHEMA = get_executable_schema()
+t = introspection_from_schema(SCHEMA)
+
+# Write schema to JSON file
+with open('./schema.json', 'w') as f:
+f.write(json.dumps(t))
+```
+