Add a script to automatically build, and install ATLauncher

Minecraft/setup_atlauncher

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+rm -rf ~/.atlauncher
+mkdir ~/.atlauncher
+
+mkdir ~/.atlauncher/bin
+pushd ATLauncher
+
+./gradlew build
+
+pushd packaging/linux
+
+chmod +x build.sh
+sudo ./build.sh
+pushd out
+sudo dpkg -i ./atlauncher*.deb
+popd
+
+popd
+
+USER=$(whoami)
+sudo chown -Rv $USER:$USER packaging
+
+popd