Add README badges

README.md

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 # Mittsu: 3MF
+
+![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/manyfold3d/mittsu-3mf/build-workflow.yml)
+[![Maintainability](https://api.codeclimate.com/v1/badges/5034e99af93f7cc58e71/maintainability)](https://codeclimate.com/github/manyfold3d/mittsu-3mf/maintainability)
+[![Test Coverage](https://api.codeclimate.com/v1/badges/5034e99af93f7cc58e71/test_coverage)](https://codeclimate.com/github/manyfold3d/mittsu-3mf/test_coverage)
+![Libraries.io dependency status for latest release](https://img.shields.io/librariesio/release/rubygems/mittsu-3mf)
+
+
+![GitHub Release](https://img.shields.io/github/v/release/manyfold3d/mittsu-3mf)
+![Gem Downloads (for latest version)](https://img.shields.io/gem/dtv/mittsu-3mf)
+![Dependent repos (via libraries.io)](https://img.shields.io/librariesio/dependent-repos/rubygems/mittsu-3mf)
+
 3MF support for [Mittsu](https://github.com/danini-the-panini/mittsu).
 
 ## Installation