docs: add ci workflow badges to README

Author: thiagowfx

README.md

@@ -1,2 +1,6 @@
 # pancake
+
+[![Pre-commit](https://github.com/thiago-perrotta/pancake/workflows/Pre-commit/badge.svg)](https://github.com/thiago-perrotta/pancake/actions/workflows/pre-commit.yml)
+[![Pre-commit auto-update](https://github.com/thiago-perrotta/pancake/workflows/Pre-commit%20auto-update/badge.svg)](https://github.com/thiago-perrotta/pancake/actions/workflows/pre-commit-autoupdate.yml)
+
 A potpourri of sweet ingredients