[rust] Update Selenium Manager roadmap in README

[bonigarcia]

Description

This PR updated the roadmap (i.e., milestone planed) for the initial development of Selenium Manager.

Motivation and Context

Part of the Selenium Manager development.

Types of changes

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

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[titusfortner]

Also need to be able to support M1 architecture; cross-compilation?
How are we determining 32 vs 64 right now? Should that be configurable?
Eventually need to figure out if we can solve the snap issue for people.

[bonigarcia]

Regarding ARM (or other architectures), I think that is not priority. I tried the Selenium Manager macOS binary (generated in GH Actions) in a macOS M1 and it works. Regarding 32-64 arch, I am not sure. It would be interesting to test the current binaries (Windows, macOS, Linux) generated in GH Actions in different platforms.

[titusfortner]

I think that is not priority

I'm not saying it is a priority, but it should be on a list of possible features. Maybe not part of "roadmap" per se.