adding script for starting everything in local

.dockerignore

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+src/Lavalink
+start.*

src/start.bat

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+@echo off
+echo "Starting Lavalink server and waiting 20s..."
+RUN "java -jar Lavalink/Lavalink.jar 1>/dev/null &" # showing only stderror
+timeout /t 30
+echo "Done."
+RUN "python -u ./main.py"

src/start.sh

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+#!/usr/bin/env bash
+echo "Starting Lavalink server and waiting 20s..."
+java -jar Lavalink/Lavalink.jar 1>/dev/null & # showing only stderror
+sleep 20
+echo "Done."
+python3 -u ./main.py