added some api calls

NOTES.md

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+# mpd commands
+
+- [x] previous track
+- [x] next track
+- [x] stop
+- [x] play/pause
+- [x] set track progress
+- [x] set volume
+- [x] repeat queue
+- [x] shuffle queue
+- [ ] set fade
+- [ ] add track to queue
+- [ ] rm track from queue
+- [ ] move track in queue
+- [ ] clear queue
+- [ ] list tracks in music db
+- [ ] list playlists
+- [ ] save playlist
+- [ ] delete playlist
+