Readme suggests that rules_cc is not needed yet which will change with Bazel 8

[fhanau]

Description of the problem / feature request:

README.md states that "There is no need to use rules from this repository just yet". This is true for Bazel 7 and below but will change with Bazel 8 where importing rules_cc is required for using CC rules. While Bazel 8 has not been released yet, it is still confusing for developers who want to start trying out Bazel 8 early. This should be updated to state that rules_cc will be needed for Bazel 8.

Feature requests: what underlying problem are you trying to solve with this feature?

Documentation is misleading and suggests to developers that they won't need rules_cc whereas it will be needed when transitioning to the upcoming Bazel 8 release.