Release tag needed

[tophyr]

Hi @caramelli, I'm adding your implementation here of DirectFB to vcpkg (microsoft/vcpkg#48418). The vcpkg system manages ports by semantic versioning and it likes to use the version of the port as a tag lookup in the git repository. Right now I've simply pinned the current master tip as "the blessed revision", but it would be very helpful if there were an official tag that I could reference instead.

The tag name (and format going into the future) that I would suggest is v2.0.0 but we can work with any naming format you would prefer. It's just easiest to build the tag name out of the vcpkg version string "2.0.0"

Thanks!