add a section on the new melody features from klaus to release notes

[jwunderl]

Add a section with some notes on the improvements to the sound & thanks.

(@klausw in case I misrepresented any of the changes, the changes were a little while ago so I might have missed some subtleties when reviewing them. And thanks again!)

[ganicke]

Thanks for the RTrim on those lines too!

[klausw]

Thanks! FYI, I just posted microsoft/pxt-arcade#3002 which adds the new waveforms to the documentation. If that gets merged, maybe consider linking to it from the changelog?

[Jaqster]

Looks good!

[Jaqster]

By the way @klausw - my kids and I just spent the last 15 minutes playing around with your new sounds! https://arcade.makecode.com/91960-59425-02296-62940 They're so awesome!!! THANK YOU :-)

[jwunderl]

@klausw That PR looks good too! We working through some build issues right now so might have to wait until tomorrow to get both of these docs changes in, but I've updated the attribution ~

[klausw]

@klausw That PR looks good too! We working through some build issues right now so might have to wait until tomorrow to get both of these docs changes in, but I've updated the attribution ~

Thank you! Just to avoid misunderstandings, I wasn't asking for that change to get called out specifically, what I meant was that it may be useful to add a link to https://arcade.makecode.com/developer/sound as a pointer for people who want to experiment with the additions.

By the way @klausw - my kids and I just spent the last 15 minutes playing around with your new sounds! https://arcade.makecode.com/91960-59425-02296-62940 They're so awesome!!! THANK YOU :-)

Glad to hear it! I'm currently adding a few more that could be useful for games, I'll update the forum thread once I have something to show.