More projects for the Projects using Ruma page

[jplatte]

Things that weren't initially on the page but I'd like to have there:

• https://github.com/lieuwex/matrix-appservice-rs
• https://github.com/lieuwex/tomsg-matrix
• https://github.com/florianjacob/synadminctl
• https://github.com/keymaker-mx/keymaker-bot

[jplatte]

@lieuwex how is it going? Are you planning to get back to https://github.com/lieuwex/matrix-appservice-rs or https://github.com/lieuwex/tomsg-matrix? If they had some more README info, I would have already included them 🙂

[jplatte]

@MTRNord would be really cool if you could add a readme to https://github.com/keymaker-mx/keymaker-bot, then I'd immediately link to it 🙂