Added play, pause, previous track, next track actions

[giftimie]

Added some basic actions to control the player, shown when no query is made.

This is quite literally my first time working with C#. I come from a Java and NodeJS background, so it was not too hard to get used to the language but please let me know any suggestions. Depending on my spare time I may contribute to this repo every now and then, so I'd like to add as much value as possible :)

[waaverecords]

You beat me to it. I was gonna work on adding this this weekend. Great contribution. I'll test it tomorrow.

Thanks @giftimie!

[waaverecords]

One thing. Can you also update the docs?

[giftimie]

Oops, missed that part. Documentation updated

[waaverecords]

Thanks! Mergin it. This will be included in the next release.

[daerup]

Would it be able to add controls for shuffle and repeat?