docs: map common X data tasks

[kriptoburak]

Summary

• Map customer questions to exact REST routes.
• Add the verified OpenSSF badge and descriptive heading.
• Preserve generated SDK contracts.

Validation

• git diff --check
• GitHub CI must run lint, build, and tests
• No Java runtime is installed locally

This PR is excluded from two-person-review evidence without another human review.

Note

Add 'Common X Data Tasks' section to README mapping data tasks to REST routes

Updates README.md with a new section containing a table that maps customer questions (tweet search, timelines, followers, following, home timeline, monitors, posting) to their corresponding REST routes with brief workflow notes. Also adds an OpenSSF Best Practices badge and revises the short description.

^{Macroscope summarized 19151df.}

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[kriptoburak]

All current checks pass at 19151df. The final head is maintainer-authored and has no independent human review. This merge is excluded from OpenSSF two-person-review evidence.