feat: add GitHub Codespaces badge

{{ cookiecutter.__project_name_kebab_case }}/README.md

@@ -1,4 +1,4 @@
-[![Open in Dev Containers](https://img.shields.io/static/v1?label=Dev%20Containers&message=Open&color=blue&logo=visualstudiocode)](https://vscode.dev/redirect?url=vscode://ms-vscode-remote.remote-containers/cloneInVolume?url={{ cookiecutter.project_url.replace("https://", "git@").replace(".com/", ".com:") if cookiecutter.private_package_repository_url else cookiecutter.project_url }})
+[![Open in Dev Containers](https://img.shields.io/static/v1?label=Dev%20Containers&message=Open&color=blue&logo=visualstudiocode)](https://vscode.dev/redirect?url=vscode://ms-vscode-remote.remote-containers/cloneInVolume?url={{ cookiecutter.project_url.replace("https://", "git@").replace(".com/", ".com:") if cookiecutter.private_package_repository_url else cookiecutter.project_url }}){% if cookiecutter.continuous_integration == "GitHub" %} [![Open in GitHub Codespaces](https://img.shields.io/static/v1?label=GitHub%20Codespaces&message=Open&color=blue&logo=github)](https://github.com/codespaces/new/{{ cookiecutter.project_url.replace("https://github.com/", "") }}){% endif %}
 
 # {{ cookiecutter.project_name }}