Update client listing: Boka

[xlc]

I would like to list/change the following JAM client implementation on https://jamcha.in/clients:

• Name: Boka
• Bio: TBD
• Optional website: ""
• Language: Swift
• Language Set: B
• Finished milestones: 0
• Optional contact (email/matrix/tg etc): bryan@acala.network

[ggwpez]

Added https://jamcha.in/clients/4 🙌
Feel free to ping once here is a bio.

[xlc]

Let's use this one for now: Boka / 波卡 / bō kǎ: JAM built with Swift. Brought to you by Laminar Labs.

[ggwpez]

Process moved to w3f https://github.com/w3f-webops/graypaper-website/issues/new?assignees=&labels=&projects=&template=client-listing-request.md&title=Client+Listing%3A+XYZ
Will still update it here.