Adding a slightly reorganized version of skyler's revamped s.a.c.

Change-Id: I19439883c25d887fa4409b33a70c235af3a78eaf
diff --git a/src/porting/sensors.md b/src/porting/sensors.md
new file mode 100755
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+++ b/src/porting/sensors.md
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+# Sensors #
+
+Android defines a user space C abstraction interface for sensor hardware. The interface header is defined in 
+`hardware/libhardware/include/hardware/sensors.h`.
+In order to integrate sensors with Android you need to build a shared library that implements this interface. 
+
+The types of sensors currently supported by Android include:
+
+- Accelerometer
+- Magnetic Field
+- Orientation
+- Gyroscope
+- Light
+- Pressure
+- Temperature
+- Proximity
+ 
+## Building a Sensor Library ##
+
+To implement a Sensors driver, create a shared library that implements the interface defined in `sensors.h`. You must name your shared library 
+`libsensors.so` so that it will get loaded from `/system/lib` at runtime. 
+
+The following stub file, `Android.mk`, ensures that `libsensors` compiles and links to the appropriate libraries:
+
+    LOCAL_PATH := $(call my-dir)
+    include $(CLEAR_VARS)
+
+    LOCAL_MODULE := sensors
+
+    LOCAL_PRELINK_MODULE := false
+
+    LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+
+    LOCAL_SHARED_LIBRARIES := liblog
+    # include any shared library dependencies
+
+    LOCAL_SRC_FILES := sensors.c
+
+    include $(BUILD_SHARED_LIBRARY)
+ 
+Doxygen content is unavailable at the moment as source.android.com is deconstructed and then reconstructed. Sorry for the inconvenience!