[docs] Add Hacktoberfest 2025 ML guide for contributors #20237
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Created comprehensive guide for Hacktoberfest 2025 contributors interested in ROOT's machine learning capabilities through TMVA.
Includes:
This documentation helps onboard new contributors to ROOT's ML ecosystem and aligns with the hacktoberfest topic.
Submitted for Hacktoberfest 2025.
This Pull request:
Changes or fixes:
Checklist:
This PR fixes #20237