doc: Add helpful setup instructions for quick start for new devs.

BUILDING.md

@@ -8,8 +8,10 @@ This guide explains how to build TimeSafari for different platforms using the co
 
 ```bash
 # 🖥️ Web Development
-npm run build:web:dev          # Start development server with hot reload
-npm run build:web:prod         # Production build
+npm install                          # setup -- and pkgx.dev `dev` command before this will set environment with npm, etc
+npm run build:web:serve -- --test    # Start with test endorser server
+npm run build:web:dev                # Start development server with hot reload with local endorser server
+npm run build:web:prod               # Production build
 
 # 📱 Mobile Development  
 npm run build:ios              # iOS build (opens Xcode)