add icon font

license.txt

@@ -20,8 +20,23 @@ freely, subject to the following restrictions:
 
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-All content under 'data' except the font (which has its own license) is
-released under CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/).
+All content under 'data' except the font files, (who have their own licenses):
+Apache 2.0 for the 'Icon.tff' file:
+Copyright Google
+
+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.
+
+The other fonts are released under CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/).
 
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