tsk-79: Create function to generate CoverArt filename (#80)

Closes #79

Reviewed-on: #80
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

src/types.rs

@@ -1,6 +1,14 @@
+#[derive(Debug)]
 pub enum MusicTypes {
     DefaultMusicExtension,
     WavExtension,
     FlacExtension,
     MPThreeExtension,
 }
+
+#[derive(Debug)]
+pub enum CoverArtTypes {
+    PngExtension,
+    JpegExtension,
+    JpgExtension,
+}