feat(readme): Add badges (supabase#306)

Author: iambriccardo

README.md

@@ -9,6 +9,25 @@
   <h1 align="center">ETL</h1>
 
   <p align="center">
+    <a href="https://github.com/supabase/etl/actions/workflows/ci.yml">
+      <img alt="CI" src="https://github.com/supabase/etl/actions/workflows/ci.yml/badge.svg?branch=main">
+    </a>
+    <a href="https://coveralls.io/github/supabase/etl?branch=main">
+      <img alt="Coverage Status" src="https://coveralls.io/repos/github/supabase/etl/badge.svg?branch=main">
+    </a>
+    <a href="https://github.com/supabase/etl/actions/workflows/docs.yml">
+      <img alt="Docs" src="https://github.com/supabase/etl/actions/workflows/docs.yml/badge.svg?branch=main">
+    </a>
+    <a href="https://github.com/supabase/etl/actions/workflows/docker-build.yml">
+      <img alt="Docker Build" src="https://github.com/supabase/etl/actions/workflows/docker-build.yml/badge.svg?branch=main">
+    </a>
+    <a href="https://github.com/supabase/etl/actions/workflows/audit.yml">
+      <img alt="Security Audit" src="https://github.com/supabase/etl/actions/workflows/audit.yml/badge.svg?branch=main">
+    </a>
+    <a href="LICENSE">
+      <img alt="License" src="https://img.shields.io/badge/License-Apache_2.0-blue.svg">
+    </a>
+    <br />
     Build real-time Postgres replication applications in Rust
     <br />
     <a href="https://supabase.github.io/etl"><strong>Documentation</strong></a>