add CI badge to README

README.md

@@ -1,5 +1,7 @@
 # monaco-tm
 
+![TypeScript build](https://github.com/bolinfest/monaco-tm/actions/workflows/verify-build.yml/badge.svg)
+
 This gets TextMate grammars working in standalone Monaco by leveraging
 `vscode-oniguruma` and `vscode-textmate`. For more context, see:
 https://github.com/microsoft/monaco-editor/issues/1915.