Added BSD license badge

README.md

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-# osync  [![Build Status](https://travis-ci.org/deajan/osync.svg?branch=master)](https://travis-ci.org/deajan/osync) [![GitHub Release](https://img.shields.io/github/release/deajan/osync.svg?label=Latest)](https://github.com/deajan/osync/releases/latest)
+# osync  [![Build Status](https://travis-ci.org/deajan/osync.svg?branch=master)](https://travis-ci.org/deajan/osync) [![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause) [![GitHub Release](https://img.shields.io/github/release/deajan/osync.svg?label=Latest)](https://github.com/deajan/osync/releases/latest)
 
 A two way filesync script running on bash Llinux, BSD, Android, MacOSX, Cygwin, MSYS2, Win10 bash  and virtually any system supporting bash).
 File synchronization is bidirectional, and can be run manually, as scheduled task, or triggered on file changes in deamon mode.