docs: update readme to include important links

README.md

@@ -3,6 +3,10 @@
 [![Build](https://github.com/Dogacel/kotlinx-protobuf-gen/actions/workflows/build.yaml/badge.svg)](https://github.com/Dogacel/kotlinx-protobuf-gen/actions/workflows/build.yaml)
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+[![Commits](https://img.shields.io/github/commit-activity/m/dogacel/kotlinx-protobuf-gen.svg?label=commits)](https://github.com/dogacel/kotlinx-protobuf-gen/pulse)
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+[![Release](https://img.shields.io/github/release-date/dogacel/kotlinx-protobuf-gen.svg?label=release)](https://github.com/dogacel/kotlinx-protobuf-gen/commits)
 
 Generate kotlin data classes from `protobuf` files that supports _Kotlin Native_ that can be serialized and
 deserialized to protobuf using [kotlinx.serialization](https://github.com/Kotlin/kotlinx.serialization).