Add the OSSF and other action badges to the top of the README (#149)

Co-authored-by: Alan Strohm <[email protected]>

Author: rsned

README.md

@@ -1,4 +1,6 @@
-# Overview
+# S2 geometry library in Go
+
+[![Go Build and Test](https://github.com/golang/geo/actions/workflows/go.yml/badge.svg)](https://github.com/golang/geo/actions/workflows/go.yml) [![CodeQL](https://github.com/golang/geo/actions/workflows/github-code-scanning/codeql/badge.svg)](https://github.com/golang/geo/actions/workflows/github-code-scanning/codeql) [![golangci-lint](https://github.com/golang/geo/actions/workflows/golangci-lint.yml/badge.svg)](https://github.com/golang/geo/actions/workflows/golangci-lint.yml) [![OpenSSF Scorecard](https://img.shields.io/ossf-scorecard/github.com/golang/geo?label=OpenSSF%20Scorecard&style=flat)](https://scorecard.dev/viewer/?uri=github.com/golang/geo)
 
 S2 is a library for spherical geometry that aims to have the same robustness,
 flexibility, and performance as the best planar geometry libraries.