add README gpl3 text and change license headers a bit

README.md

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+UVOS libuvoscam and uvoscam_cli
+==============
+
+This is a library and cli application that wraps aravis to avoid GOBJECT leakage into a c++ application using aravis. On top of this it also implements color space conversions and demosaicing  
+license: GPL v3.0 or later
+
+Building and Installing
+----------
+
+Requirements:
+
+* cmake
+* pkg-config
+* openCV v3.0 or later
+* aravis-0.8
+
+Build instructions:
+
+1. run 'cmake .'
+2. run 'make'
+
+To install run 'make install' as root.
+
+
+uvoscam_cli usage
+----------
+
+To unwrap a object:
+
+1. run 'uvoscam_cli'
+2. at the > prompt type 'list' to show the cameras available
+3. open a camera with 'open $(index)' 
+4. use 'capture $(imageFileName)' to save an image
+5. for more available commands type 'help'