Moving requirements.md to /doc/install directory

doc/install/requirements.md

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+# Requirements
+
+## Web Client
+
+Supported Operating Systems and Browsers: 
+
+- PC: Windows 7, Windows 8 (Chrome 43+, Firefox 38+, Internet Explorer 10+)  
+- Mac: OS 10 (Safari 7, Chrome 43+)  
+- Linux: Arch 4.0.0  (Chrome 43+)  
+- iPhone 4s and higher (Safari on iOS 8.3+, Chrome 43+)  
+- Android 5 and higher (Chrome 43+)  
+
+## Server
+
+While the pre-released version of Mattermost is not currently supported in production, the intention from the product team is to support: 
+
+- Ubuntu
+- Debian
+- CentOS
+- RedHat Enterprise Linux
+- Oracle Linux
+
+The Mattermost roadmap does not currently include production support for Fedora, FreeBSD or Arch Linux.