Add fullstack example

examples/fullstack/backend/app/middleware/silent_auth_middleware.ts

@@ -0,0 +1,19 @@
+import type { HttpContext } from '@adonisjs/core/http'
+import type { NextFn } from '@adonisjs/core/types/http'
+
+/**
+ * Silent auth middleware can be used as a global middleware to silent check
+ * if the user is logged-in or not.
+ *
+ * The request continues as usual, even when the user is not logged-in.
+ */
+export default class SilentAuthMiddleware {
+  async handle(
+    ctx: HttpContext,
+    next: NextFn,
+  ) {
+    await ctx.auth.check()
+
+    return next()
+  }
+}