Use a single license file and refer to it in the documentation

Author: lu-zero

COPYING

@@ -1,14 +1,16 @@
-Autotooled version of the opensource Intel media sdk dispatcher.
+# Autotooled version of the opensource Intel media sdk dispatcher.
 
-# Linux
+[![LICENSE](https://img.shields.io/badge/license-BSD3-blue.svg)](LICENSE)
 
-## Requirements
+## Linux
+
+### Requirements
 
 * A C/C++ compiler
 * autotools
 * libva
 
-## Building
+### Building
 
 ```
 autoreconf -i
@@ -17,28 +19,28 @@ make -j$(nproc)
 make install
 ```
 
-# Windows
+## Windows
 
 The dispatcher provided by Intel only works on MS visual studio builds due the fact it is written in C++ and mingw64 isn't ABI and library compatible.
 This set of build systems let you easily build a mingw-w64 one.
 
-## Requirements
+### Requirements
 
 * MediaSDK drivers from Intel
 * mingw-w64 toolchain
 * autotools or cmake (pick your poison)
 
-## Building using autotools
+### Building using autotools
 
-### Cross compile
+#### Cross compile
 ``` sh
 autoreconf -i
 ./configure --host=x86_64-w64-mingw32
 make -j$(nproc)
 make install DESTDIR=/usr/x86_64-w64-mingw32
 ```
 
-### Building on a native mingw-w64 environment
+#### Building on a native mingw-w64 environment
 ``` sh
 autoreconf -i
 ./configure --prefix=/mingw64