Create LLMS.md on create-twenty-app (#18091)

Managed to create a many to many app with minimal instructions. File
will need to be enriched with more pitfalls.

---------

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

Author: thomtrp

packages/create-twenty-app/src/constants/base-application/LLMS.md

@@ -0,0 +1,9 @@
+## Base documentation
+
+- Documentation: https://docs.twenty.com/developers/extend/capabilities/apps
+- Rich app example: https://github.com/twentyhq/twenty/tree/main/packages/twenty-sdk/src/cli/__tests__/apps/rich-app
+
+## Common Pitfalls
+
+- Creating an object without an index view associated. Unless this is a technical object, user will need to visualize it.
+- Creating a view without a navigationMenuItem associated. This will make the view available on the left sidebar.

packages/create-twenty-app/src/constants/base-application/README.md

@@ -36,6 +36,10 @@ yarn twenty function:execute  # Execute a function with JSON payload
 yarn twenty app:uninstall  # Uninstall app from workspace
 ```
 
+## LLMs instructions
+
+Main docs and pitfalls are available in LLMS.md file.
+
 ## Learn More
 
 To learn more about Twenty applications, take a look at the following resources: