Merge branch 'update/readme' into 'main'

Update README

See merge request !3

README.md

@@ -4,4 +4,7 @@ Shared `.gitlab-ci.yml` components for Golang.
 
 ## Features
 
-* TBD
+* Shared `Makefile` to for each step.
+* Runs race detection, memory sanitizer, code coverage, and linting.
+* Uses [`gox`](https://github.com/mitchellh/gox) to build for all supported 
+  platforms.