feat: add enable-picom-ingame.sh

apps/Lutris/enable-picom-ingame.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+# Put your game process name here (can be full name or short name)
+# If it doesn't work for .exe file, try <process name>.e instead
+# it may work.
+PROCESS=""
+
+echo "Waiting for '$PROCESS' to start..."
+until _=$(pidof $PROCESS)
+do
+    sleep 1
+done
+
+echo "Starting picom..."
+picom --experimental-backends &
+picom_pid=$!
+echo "picom PID: $picom_pid"
+
+echo "Waiting for '$PROCESS' to exit..."
+while [[ $(pidof $PROCESS) ]]; do
+   sleep .5
+done
+echo "Killing picom..."
+kill -15 $picom_pid
+echo "Done."