Add files and scripts to build for Steam Link

app/deploy/steamlink/moonlight.sh

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+#!/bin/sh
+
+# The default HOME is not persistent, so override
+# it to a path on the onboard flash. Otherwise our
+# pairing data will be lost each reboot.
+HOME=/usr/local/moonlight
+
+# Write output to a logfile in /tmp
+exec ./bin/moonlight > /tmp/moonlight.log

app/deploy/steamlink/toc.txt

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+name=Moonlight
+icon=moonlight.png
+run=moonlight.sh