Add badges to README (#2519)

### Description

`main` is ✅ so let's 💪

README.md

@@ -1,5 +1,15 @@
 # Hyperlane
 
+[![GitHub Actions][gha-badge]][gha] [![codecov](https://codecov.io/gh/hyperlane-xyz/hyperlane-monorepo/branch/main/graph/badge.svg?token=APC7C3Q2GS)](https://codecov.io/gh/hyperlane-xyz/hyperlane-monorepo) [![Foundry][foundry-badge]][foundry] [![License: MIT][license-badge]][license]
+
+[gha]: https://github.com/hyperlane-xyz/hyperlane-monorepo/actions
+[gha-badge]: https://github.com/PaulRBerg/prb-math/actions/workflows/ci.yml/badge.svg
+[codecov-badge]: https://img.shields.io/codecov/c/github/hyperlane-xyz/hyperlane-monorepo
+[foundry]: https://getfoundry.sh/
+[foundry-badge]: https://img.shields.io/badge/Built%20with-Foundry-FFDB1C.svg
+[license]: https://opensource.org/licenses/MIT
+[license-badge]: https://img.shields.io/badge/License-MIT-blue.svg
+
 ## Versioning
 
 Note this is the branch for Hyperlane v2.