added sh tagging to the README

also made the install bash script executable

HMD setup/install_stardust.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+echo "make sure you have the dependencies installed first!"
+mkdir stardust
+cd stardust
+git clone -b dev https://github.com/StardustXR/server.git
+git clone -b dev https://github.com/StardustXR/flatland.git
+git clone -b dev https://github.com/StardustXR/non-spatial-input.git
+git clone -b dev https://github.com/StardustXR/protostar.git
+cd server
+cargo build --release || cargo build --release
+cd ../flatland
+cargo build --release
+cd ../protostar
+cargo build --release
+cd ../non-spatial-input/simular
+cargo build --release
+cd ../manifold
+cargo build --release
+cd ../../
+echo "Assuming no error occured you should be good to go!"