docs: add an example quickstart for creating a new application easily

quickstart-create-application.js

@@ -0,0 +1,26 @@
+import { randomUUID } from 'node:crypto'
+
+import * as Applications from './src/pg/application.js'
+import pg from './src/pg/index.js'
+
+await pg.transaction(async (trx) => {
+  const { application_key, authorization_key, ...application } = await Applications.create(
+    {
+      account_id: randomUUID(),
+      application_id: randomUUID(),
+      session_timeout: 30,
+      title: randomUUID(),
+    },
+    trx,
+  )
+
+  console.info('Application created')
+  console.info(application)
+
+  console.group('client keys')
+  console.info('authorization_key', authorization_key.toString('base64'))
+  console.info('application_key', application_key.toString('base64'))
+  console.groupEnd()
+})
+
+process.exit(0)