Add docs skeleton

package.json

@@ -0,0 +1,9 @@
+{
+  "scripts": {
+    "docs:dev": "vuepress dev docs",
+    "docs:build": "vuepress build docs"
+  },
+  "devDependencies": {
+    "vuepress": "^0.14.1"
+  }
+}