Add README.md file to SL4N.
Verify format with http://dillinger.io/
Bug: 27253042
Change-Id: Iba487658c4ec8e284860943a524b053dadcd0945
diff --git a/sl4n/README.md b/sl4n/README.md
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+Scripting Layer For Native
+=============================
+
+### Introduction
+Scripting Layer for Native, SL4N, is an automation toolset for calling Android native Binder
+APIs and accessing the HAL layer in an platform-independent manner. This tool enables remote
+automation of these layers via ADB.
+
+### Build Instructions
+Building SL4N requires a system build.
+
+For the initial build of Android:
+
+ cd <ANDROID_SOURCE_ROOT>
+ source build/envsetup.sh
+ lunch aosp_<TARGET>
+ make [-j15]
+
+*where <ANDROID_SOURCE_ROOT> is the root directory of the android tree and <TARGET> is the lunch
+target name*
+
+Then Build SL4N:
+
+ cd <ANDROID_SOURCE_ROOT>/packages/apps/Test/connectivity/sl4n
+ mm [-j15]
+
+### Install Instructions
+Run the following command:
+
+ adb push <ANDROID_SOURCE_ROOT>/out/target/product/<TARGET>/system/bin/sl4n /system/bin
+
+Library dependencies required:
+
+ adb push <ANDROID_SOURCE_ROOT>/out/target/product/<TARGET>/system/lib/libbinder.so /system/lib
+ adb push <ANDROID_SOURCE_ROOT>/out/target/product/<TARGET>/system/lib/libchrome.so /system/lib
+ adb push <ANDROID_SOURCE_ROOT>/out/target/product/<TARGET>/system/lib/libevent.so /system/lib
+
+Optional library dependency for running tests that exercise the Bluetoothtbd service:
+
+ cd <ANDROID_SOURCE_ROOT>/system/bt/service
+ mm [-j15]
+ adb push <ANDROID_SOURCE_ROOT>/out/target/product/<TARGET>/system/bin/bluetoothtbd /system/bin
+
+### Run Instructions
+a) SL4N is launched from ADB shell; or
+b) To enable RPC access from the command prompt:
+
+ adb forward tcp:<HOST_PORT_NUM> tcp:<DEVICE_PORT_NUM>
+ adb shell -c "/system/bin/sl4n" &
+*where <HOST_PORT_NUM> and <DEVICE_PORT_NUM> are the tcp ports on the host computer and device.*
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