add example

example/example.js

@@ -0,0 +1,29 @@
+'use strict'
+
+const fastify = require('fastify')()
+const authenticate = {realm: 'Westeros'}
+
+const validUsername = 'Tyrion'
+const validPassword = 'wine'
+
+fastify.register(require('..'), { validate, authenticate })
+// `this` inside validate is `fastify`
+function validate (username, password, req, reply, done) {
+  if (username === validUsername && password === validPassword) {
+    done()
+  } else {
+    done(new Error('Winter is coming'))
+  }
+}
+
+fastify.after(() => {
+  fastify.addHook('onRequest', fastify.basicAuth)
+
+  fastify.get('/', (req, reply) => {
+    reply.send({ hello: 'world' })
+  })
+})
+
+const basicAuthCredentials = Buffer.from(`${validUsername}:${validPassword}`).toString('base64')
+console.log(`curl -H "authorization: Basic ${basicAuthCredentials}" http://localhost:3000`)
+fastify.listen({ port: 3000 })