update copying file per community / developer discussion

COPYING

@@ -1,3 +1,38 @@
+This repository contains the generator for the MAVLink protocol. The generator itself is
+(L)GPL v3 licensed, while the generated code is subject to different licenses:
+
+
+========================================================================================
+
+                        Exception to the (L)GPL v.3:
+
+As an exception, if you use this Software to compile your source code and
+portions of this Software, including messages ("the generator output"), are embedded
+into the binary product as a result, you may redistribute such product and such
+product is hereby licensed under the following MIT license:
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of the generated software (the "Generated Software"), to deal
+in the Generated Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Generated Software, and to permit persons to whom the Generated
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Generated Software.
+
+THE GENERATED SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE GENERATED SOFTWARE OR THE USE OR OTHER DEALINGS
+IN THE GENERATED SOFTWARE.
+
+=========================================================================================
+
+
+
                    GNU LESSER GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007