CI badge

README.md

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 # trouble
 
+[![CI](https://github.com/embassy-rs/trouble/actions/workflows/ci.yaml/badge.svg)](https://github.com/embassy-rs/trouble/actions/workflows/ci.yaml)
+
 *WIP* Basic functionality like creating a GATT server works, l2cap connection with credit flow works, but API is likely change a lot for the time being. Use [`nrf-softdevice`](https://github.com/embassy-rs/nrf-softdevice) for the time being if you want a production ready BLE stack.
 
 An Rust host BLE stack with a future goal of qualification. Currently the focus is on implementing the host on top of a HCI interface.