Add music.state

music.state.md

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+# music.state()
+Obté el estat actual de la cançó carregada.
+
+### Torna
+Alguna de les següents constants:
+* music.INVALID = 0
+* music.PLAYING = 1
+* music.PAUSED = 2
+* music.STOPPED = 3
+* music.DISABLED = 4
+
+### Exemple
+```
+local state = music.state() -- torna music.INVALID
+music.play("tema.ogg")
+local state = music.state() -- torna music.PLAYING
+music.pause()
+local state = music.state() -- torna music.PAUSED
+music.stop()
+local state = music.state() -- torna music.STOPPED
+music.enable(false)
+local state = music.state() -- torna music.DISABLED
+```
+
+### Vore també
+* [music.play](music.play)
+* [music.pause](music.pause)
+* [music.stop](music.stop)
+* [music.state](music.state)