Have a small badge for Github/Gitlab

[dixneuf19]

A common practice for repository using an external service for CI or code quality is to embed a link to a remote image from the service, to had dynamic information about the current state of the repo.
For example, does the test are passing or what is the coverage ? Here a random example

Having such a feature for burrito displaying information about TerraformLayers associated to the current repo could be interesting. For example : is the current repo correctly applied, without any drift ?