Adding Spanish (#489)

SidVal · QingWei-Li · commit 2d9e581d6312 · 2018-05-18T07:06:37.000+08:00
Fix: #484
diff --git a/docs/_navbar.md b/docs/_navbar.md
@@ -2,3 +2,4 @@
   - [:cn: 中文](/zh-cn/)
   - [:de: Deutsch](/de-de/)
   - [:uk: English](/)
+  - [:es: Spanish](https://docsify-es.js.org)
