Add RFDuino iBeacon example

docs/platforms/nordicnrf51.rst

@@ -232,3 +232,5 @@ Switch Science
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+
+.. include:: nordicnrf51_extra.rst

docs/platforms/nordicnrf51_extra.rst

@@ -0,0 +1,18 @@
+..  Copyright 2014-2015 Ivan Kravets <me@ikravets.com>
+    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.
+
+Examples
+--------
+
+All project examples are located in PlatformIO repository
+`Examples for Nordic nRF51 platform <https://github.com/platformio/platformio/tree/develop/examples/nordicnrf51>`_.
+
+* `RFDuino iBeacon <https://github.com/platformio/platformio/tree/develop/examples/nordicnrf51/rfduino-ibeacon>`_