feat(shield): Add Hillside support

[mmccoyd]

Add Hillside support, tested on real hardware. (https://github.com/mmccoyd/hillside)

Board/Shield Check-list

• This board/shield is tested working on real hardware
• Definitions follow the general style of other shields/boards upstream (Reference)
• .zmk.yml metadata file added
• Proper Copyright + License headers added to applicable files (Generally, we stick to "The ZMK Contributors" for copyrights to help avoid churn when files get edited)
• General consistent formatting of DeviceTree files
• Keymaps do not use deprecated key defines (Check using the upgrader tool)
• &pro_micro used in favor of &pro_micro_d/a if applicable
• If split, no name added for the right/peripheral half
• .conf file has optional extra features commented out

[Nicell]

Hi @mmccoyd, thanks for the PR! I'm wondering what the availability of this shield is? Is there a group buy or general availability planned, or is this strictly OSH at the moment? To lighten the review load we are only putting group buy or generally available shields in the main repository for now. OSH projects can take advantage of zmk-config repositories to share firmware. Thanks for your understanding 😄

[mmccoyd]

Nicell, It is OSH only at this point and I've got a public zmk-config for it. Thanks for the work on ZMK.

[Nicell]

I'm going to close this PR for now since there isn't wide availability, but please let us know if this changes in the future!

[kkga]

I'm building the Hillside right now, so there's at least one more person who would want this upstream 🙃

[Nicell]

Hi @kkga, you can use the zmk-config that mmccoyd has created in the Hillside repository: https://github.com/mmccoyd/zmk-config

[alternateved]

It seems that it gained traction. At least it is available in Beekeeb shop https://shop.beekeeb.com/product/hillside-keyboard-kit/. Would that be enough to add support upstream for that board?