docs: add meta management

Signed-off-by: Wing-Kam Wong <wingkwong.code@gmail.com>

packages/noco-docs/content/en/setup-and-usages/meta-management.md

@@ -0,0 +1,50 @@
+---
+title: 'Meta Management'
+description: 'Meta Management'
+position: 15
+category: 'Setup and Usages'
+menuTitle: 'Meta Managements'
+---
+
+To go to the Meta Management Portal, click ``Project Metadata`` under ``Settings`` on the leftmost menu.
+
+![image](https://user-images.githubusercontent.com/35857179/126929430-1ad086a8-0611-4f39-8c7f-580637574056.png)
+
+## Project Metadata
+
+The metadata is stored in meta directory in project level, database level, and API level. 
+
+Under ``Project Metadata``, you can perform the following operations.
+
+- Export all metadata from the meta tables to meta directory
+ 
+- Import all metadata from the meta directory to meta tables
+ 
+- Export project meta to zip file and download
+ 
+- Import project meta zip file and restart
+
+- Clear all metadata from meta tables
+
+<alert>
+  Currently the project meta can be only imported to the same DB instance. 
+</alert>
+
+## Database Metadata
+
+Under ``DB Metadata``, You can manage your models. For example, if you do not want to expose some APIs, you can untick those under APIs here.
+
+![image](https://user-images.githubusercontent.com/35857179/126928981-6c63499e-d4de-42e6-80fa-c7688480d0a0.png)
+
+The relations of all tables are listed under ``Relations``.
+
+![image](https://user-images.githubusercontent.com/35857179/126929023-dbb82353-bebf-4a44-85b9-3e4095f24b67.png)
+
+## UI Access Control
+
+You can control the access to each table and relation by roles. 
+
+![image](https://user-images.githubusercontent.com/35857179/126929212-384a91c0-645f-4958-b00b-1b89105026ea.png)
+
+![image](https://user-images.githubusercontent.com/35857179/126929223-66520c0b-9303-4a61-abf8-e7911215904d.png)
+