Badge - compatibility with MD syntax

[Kielek]

Description

Possibility to add actuated.dev badge using markdown syntax.

Motivation and Context

• I have raised an issue to propose this change (required)

Fixes: #18

PR for OpenTelemetry Automatic Instrumentation introducing support for ARM64. open-telemetry/opentelemetry-dotnet-instrumentation#3277

Current requirements, force us to allow html syntax in documentation files. If possible, it will be great to avoid this.

One of the solutions is to use common shields.io system to generate badges, alternatively you could add badge image in the proper size (120px) and support something like:

[![Arm CI sponsored by Actuated](https://docs.actuated.dev/images/actuated-badge-120.png)](https://actuated.dev/)

How Has This Been Tested?

Snippet from PR, here:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality), just documentation
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have signed-off my commits with git commit -s

[Kielek]

@alexellis, FYI

[alexellis]

LGTM

[alexellis]

Thanks for the PR