Add build badges to readme.

README.md

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 # stunpack
 
+[![CICD](https://img.shields.io/github/actions/workflow/status/dstien/stunpack/cicd.yml)](https://github.com/dstien/stunpack/actions/workflows/ci.yml)
+[![Release](https://img.shields.io/github/v/release/dstien/stunpack)](https://github.com/dstien/stunpack/releases)
+
 **Stunts/4D [Sports] Driving game resource unpacker**
 
 This program decodes packed resources and code files used by the PC version of the game "Stunts" (Brøderbund), also published as "4D Sports Driving" (Mindscape) and "4D Driving" (Electronic Arts).