added LoadFile command

commands.go

@@ -0,0 +1,19 @@
+package mpvipc
+
+type LoadFileFlag string
+
+const (
+	LoadFileReplace    LoadFileFlag = "replace"
+	LoadFileAppend     LoadFileFlag = "append"
+	LoadFileAppendPlay LoadFileFlag = "append-play"
+)
+
+func LoadFile(socket string, file string, flags LoadFileFlag) error {
+	if flags == "" {
+		flags = LoadFileReplace
+	}
+
+	cmd := &Command{[]interface{}{"loadfile", file, flags}}
+	_, err := SendCommand[any](socket, cmd)
+	return err
+}