initial commit of 'spider-check'

Ref jquery/infrastructure#455.

Author: Krinkle

.travis.yml

@@ -0,0 +1,7 @@
+language: node_js
+
+node_js: "10"
+
+script:
+- npm install spider.js@arschmitz/spider.js#master
+- node_modules/spider.js/bin/spider.js --url=https://code.jquery.com

README.md

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+[![Build Status](https://travis-ci.com/jquery/codeorigin.jquery.com.svg?branch=spider-check)](https://travis-ci.com/jquery/codeorigin.jquery.com)
+
+codeorigin.jquery.com
+=====================
+
+This branch takes care of running [spider.js](https://github.com/arschmitz/spider.js) on a regular
+basis via Travis CI to uncover broken links and such.