docs: Update documentation for GPS module

Change-Id: Iba80ca3197ec0b8529b8b34a7e9626de25fa184d
Signed-off-by: Ajay Bhargav <[email protected]>

Author: ajaybhargav

docs/Doxyfile

@@ -851,6 +851,7 @@ INPUT                  = ../include/arpa/inet.h \
                          ../include/driver/dht.h \
                          ../include/driver/ds18b20.h \
                          ../include/driver/onewire.h \
+			 ../include/gpslib.h \
                          ../include/hw/adc.h \
 			 ../include/hw/bluetooth.h \
                          ../include/hw/gpio.h \

docs/book/api/peri/gps.rst

@@ -1,8 +1,28 @@
-GPS
-===
+GPS Libaray
+===========
+
+.. toctree::
+   :maxdepth: 2
+
+MT2503 SoC has on-chip GNSS module supports GPS + GLONASS, Galileo, Beidou
+constellations. SIWISDK gps library does all the heavy lifting and make
+it easy to use the full capabilities of GNSS module. Some features of gps
+library are:
+
+* Most accurate software odometer
+* Motion detection based on GPS data
+* No postion drift after vehicle stops
+* Critical events based on user configuration:
+
+   1. Harsh Acceleration
+   2. Harsh Breaking
+   3. Harsh turning/cornering
+   4. Over speed
+
+* Vehicle turn notification
+* GPS status notification
 
 API Reference
 -------------
 
-.. .. include:: /inc/gpslib.inc
-
+.. include:: /inc/gpslib.inc