Add file .env.example and add branch dev

.env.example

@@ -0,0 +1,7 @@
+# Use this file for ".env.development" and ".env.production"
+
+# URL API (url api dev for .env.development or url api prod for .env.production)
+VITE_API_URL=https://endpont.example
+
+# Environment (development/production)
+VITE_ENV=example