Add documentation

docs/.vuepress/config.js

@@ -0,0 +1,13 @@
+module.exports = {
+  title: 'Super Graph',
+  description: 'Get an instant GraphQL API for your Rails apps.',
+
+  themeConfig: {
+    logo: '/hero.png',
+    nav: [
+      { text: 'Guide', link: '/guide' },
+      { text: 'Github', link: 'https://github.com/dosco/super-graph' },
+      { text: 'Docker', link: 'https://hub.docker.com/r/dosco/super-graph/builds' },
+    ]
+  }
+}