Add the Apache 2.0 license

LICENSE.md

@@ -0,0 +1,25 @@
+# Apache License, Version 2.0
+
+Copyright 2014 GeoData <[email protected]>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+## Third Party Software
+
+Cesium Terrain Builder includes the following third party software:
+
+* [GDAL](http://www.gdal.org),
+  [MIT/X license](http://svn.osgeo.org/gdal/trunk/gdal/LICENSE.TXT).
+
+* [Commander](http://www.github.com/clibs/commander),
+  [MIT license](https://github.com/clibs/commander#license).