docs: update note for convex

Author: NamesMT

apps/backend-convex/README.md

@@ -4,6 +4,16 @@
 
 Convex helps you kick-start amazing apps super fast and simple.
 
+## Notes:
+
+Auth is optional, you can remove it or just put the following sample config into Convex (for testing and development, do not deploy a production app with this config):
+```
+CUSTOM_JWT_ISSUER=https://topnames-dev.eu.kinde.com
+CUSTOM_JWT_JWKS_URL=https://topnames-dev.eu.kinde.com/.well-known/jwks
+```
+
+`convex dev` might create a few new files when you run it for the first time, you should discard it: `tsconfig.json`, `.gitignore`, `README.md`
+
 ## Cookbook:
 
 For developing a new feature, and for small features, create functions in `convex/` directly as per common Convex usage.