chore: automate roadmap project setup

[tcheeric]

Summary

Related issue: #____

Provide maintainers with a repeatable way to spin up a GitHub Project populated with every 1.0 roadmap task captured in the docs.

What changed?

• Added a helper script that uses the GitHub CLI to create or update the "nostr-java 1.0 Roadmap" project with draft items for each backlog entry.
• Documented the workflow in a new how-to guide and linked it from the documentation index.
• Highlighted the automation entry point in the root README for easier discovery.

BREAKING

N/A

Review focus

Ensure the scripted project items faithfully mirror the backlog in docs/explanation/roadmap-1.0.md and that the how-to steps feel accurate for maintainers who rely on GitHub Projects (beta).

Checklist

• Scope ≤ 300 lines (or split/stack)
• Title is verb + object (e.g., “Refactor auth middleware to async”)
• Description links the issue and answers “why now?”
• BREAKING flagged if needed
• Tests/docs updated (if relevant)

Testing

• mvn -q verify

  [ERROR] Non-resolvable import POM: The following artifacts could not be resolved: xyz.tcheeric:nostr-java-bom:pom:1.1.1 (absent): Could not find artifact xyz.tcheeric:nostr-java-bom:pom:1.1.1 in central (https://repo.maven.apache.org/maven2)
  

Network Access

• Blocked artifact: https://repo.maven.apache.org/maven2/xyz/tcheeric/nostr-java-bom/1.1.1/ (not published)

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https://chatgpt.com/codex/tasks/task_b_68e9f5d75fe88331be7b4806e3d31d1c