Add maintenance mode and update announce

app/Validators/maintenance/MaintenanceUpdateValidator.ts

@@ -0,0 +1,16 @@
+import { schema } from '@ioc:Adonis/Core/Validator'
+import { HttpContextContract } from '@ioc:Adonis/Core/HttpContext'
+
+export default class MaintenanceUpdateValidator {
+  constructor (protected ctx: HttpContextContract) {
+  }
+
+  public schema = schema.create({
+    reason: schema.string.optional(),
+    active: schema.boolean.optional()
+  })
+
+  public messages = {
+    required: 'The field {{field}} is required'
+  }
+}