Update development-setup.md : Easter egg developer menu

packages/noco-docs/content/en/engineering/development-setup.md

@@ -51,4 +51,14 @@ For Playwright tests, screenshots are captured on the tests. These will provide
   
 ![Screenshot 2022-09-29 at 12 43 37 PM](https://user-images.githubusercontent.com/86527202/192965070-dc04b952-70fb-4197-b4bd-ca7eda066e60.png)
 
+## Accessing 'Easter egg' menu
+
+Double click twice on empty space between `View list` & `Share` button to the left top of Grid view; following options become accessible
+1. Export Cache
+2. Delete Cache
+3. Debug Meta
+4. Toggle Beta Features
+
+![Screenshot 2023-05-23 at 8 35 14 PM](https://github.com/nocodb/nocodb/assets/86527202/fe2765fa-5796-4d26-8c12-e71b8226872e)
+