extend examples

extend/cache-control/.local-web-server.json

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+{
+  "maxage": 2000
+}

extend/cache-control/server.js

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+'use strict'
+const LocalWebServer = require('../../')
+const cacheControl = require('koa-cache-control')
+
+const ws = new LocalWebServer()
+ws.addLogging('dev')
+  .add({
+    optionDefinitions: {
+      name: 'maxage', type: Number,
+      description: 'The maxage to set on each response.'
+    },
+    middleware: function (options) {
+      return cacheControl({ maxAge: options.maxage })
+    }
+  })
+  .addStatic()
+  .addIndex()
+  .start()