Add package installation first page

content/doc/installation/from-package.en-us.md

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+---
+date: "2016-12-01T16:00:00+02:00"
+title: "Installation from package"
+weight: 10
+toc: true
+draft: false
+menu:
+  sidebar:
+    parent: "installation"
+    name: "From package"
+    weight: 20
+    identifier: "install-from-package"
+---
+
+# Installation from package
+
+Currently we only support `brew` if you are using macOS.
+
+```
+brew tap go-gitea/gitea
+brew install gitea
+```
+
+## TBD

content/doc/installation/from-package.zh-cn.md

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+---
+date: "2016-12-01T16:00:00+02:00"
+title: "选择包安装"
+weight: 10
+toc: true
+draft: false
+menu:
+  sidebar:
+    parent: "installation"
+    name: "选择包安装"
+    weight: 20
+    identifier: "install-from-package"
+---
+
+# 使用包安装
+
+当前我们仅支持 macOS 平台下的 `brew` 安装
+
+```
+brew tap go-gitea/gitea
+brew install gitea
+```
+
+## TBD