Updated README with Apache license details

README.md

@@ -22,6 +22,13 @@ project into your workspace and run it as "Android JUnit Test".
 
 #Licence
 Gnucash for Android is free software; you can redistribute it and/or 
-modify it under the terms of the GNU General Public License as 
-published by the Free Software Foundation; either version 2 of 
-the License, or (at your option) any later version.
+modify it under the terms of the Apache license, version 2.0.
+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.