Updated docs/licenses

LICENSE.txt

@@ -0,0 +1,17 @@
+GlidePort is (c)2019 Eric Lasota
+
+Based on Glider PRO by John Calhoun
+
+GlidePort is made available under the following dual-license terms:
+
+- You may use any portion of the GlidePort project's source code under the
+  conditions of the GNU General Public License version 2, as published in the
+  included LICENSE-GPL2.txt file.
+
+- If you obtain a license to use the Glider PRO source code under terms other
+  than the terms of the GNU General Public License version 2, or if you do not
+  require a license (i.e. because you hold the copyright), or if you are are
+  permitted to use Glider PRO's source code for any other reason, you may use
+  any new source code and modifications in the GlidePort source code under the
+  conditions of the MIT license, as published in the included LICENSE-MIT.txt
+  file.