feat: simple dev.sh script to launch development environment

dev.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+trap ctrl_c INT
+
+function ctrl_c() {
+	stop
+	exit 0
+}
+
+function stop() {
+	kill %3
+	kill %2
+	kill %1
+
+	wait
+}
+
+npm run watch &
+./gradlew classes --continuous &
+./gradlew bootRun &
+
+read -rp "Press Enter to stop"
+
+stop