add the categories page

Zhili Yang · Zhili Yang · commit 3b14d25c8f2f · 2017-10-02T17:00:36.000+08:00
diff --git a/source/categories/index.md b/source/categories/index.md
@@ -1,4 +1,5 @@
 ---
 title: categories
 date: 2017-10-02 09:57:26
+type: "categories"
 ---
