added depdendcy check

rmmusic

@@ -1,4 +1,14 @@
 #!/bin/bash
+DEPENDENCY_CHECK_COMMANDS=("spleeter" "ffmpeg")
+
+for DEPENDENCY in "${DEPENDENCY_CHECK_COMMANDS[@]}"; do
+  if ! command -v "$DEPENDENCY" 1>/dev/null; then
+    printf "%s not found. Please install it.\n" "$DEPENDENCY" >&2
+    exit 2
+  fi
+done
+unset DEPENDENCY
+
 
 inputfile=$1
 outputfolder=rmmusic