grove: updated and added headers with tags

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/grove/groverotary.h

@@ -0,0 +1,43 @@
+/*
+ * Place-holder Header for Documentation and future API change
+ *
+ * Copyright (c) 2014 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+ 
+/**
+ * @library grove
+ * @sensor groverotary
+ * @comname Grove Rotary Angle Sensor
+ * @type ainput
+ * @man seeed
+ * @con analog
+ *
+ * @brief C++ API for Grove Rotary Angle Sensor (Knob)
+ *
+ * Very basic UPM module for Grove rotary angle sensor (knob) on analog. Provides
+ * a set of functions to read the absolute pin value, degrees or radians and another
+ * to do the same relative to the center of the knob's range.
+ *
+ * @image html groverotary.jpeg
+ * @snippet groverotary.cxx Interesting
+ */
+