Add README with instructions

README

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+# Vulkan triangle example application
+
+## Overview
+This repo contains the source for an applicaiton that renders a triangle using Vulkan and then saves the output as a PNG. This applicaiton is meant as a starting point to debug freedreno featurework for Chrome OS.
+
+## Instructions
+- Enter the CrOS chroot and set up the boards you want to test against (`setup_board --board=${BOARD}`). 
+- Emerge Vulkan, mesa, and libpng to the device under test (`emerge vulkan-loader media-libs/mesa libpng && cros deploy ${IP_ADDR} ${PACKAGES}`).
+- `make shaders`
+- `target={local, atlas (i915), cheza (adreno)} make`