docs(readme): update the README with badges

Author: timoa

README.md

@@ -1,2 +1,14 @@
-# terraform-oci-vscode-server
-Terraform project that deploys VSCode Server on Oracle Cloud Infrastructure (free tier)
+# Deploy VSCode Server on OCI with Terraform
+
+[![Latest Release][release-badge]][release-url]
+[![Build Status][github-badge]][github-url]
+[![License][license-badge]][license-url]
+
+Terraform project that deploys VSCode Server on Oracle Cloud Infrastructure using only the free tier.
+
+[github-badge]: https://github.com/timoa/terraform-oci-vscode-server/workflows/Terraform/badge.svg
+[github-url]: https://github.com/timoa/terraform-oci-vscode-server/actions?query=workflow%3ATerraform
+[release-badge]: https://img.shields.io/github/release/timoa/terraform-oci-vscode-server.svg
+[release-url]: https://github.com/timoa/terraform-oci-vscode-server/releases/latest
+[license-badge]: https://img.shields.io/github/license/timoa/terraform-oci-vscode-server.svg
+[license-url]: https://github.com/timoa/terraform-oci-vscode-server/blob/main/LICENSE