Add "MechanicalFlower Godot Template"

[florianvazelle]

Hi 👋

I'm submitting a PR to add my general-purpose template to the list, with :

• CI/CD via GitHub Actions
• Code formatting enforced by gdformat, and clang-format, via pre-commit
• Keep track of licenses and attribution
• Addons management with gd-plug
• Automatic dependencies bumping with renovate
• Command runner with just, that handle tools installation, exporting, publishing ...