Fix stale README references for CI and testing

[Bojun-Vvibe]

Repo: facebook/zstd (⭐ 25000)
Type: docs
Files changed: 1
Lines: +5/-3

What

Updates the top-level README to point readers at the current CI workflow location and the actual local test script path. The change replaces a dead reference to .travis.yml with .github/workflows/, and fixes the testing instructions from playTest.sh in src/tests to tests/playTests.sh from the repository root.

Why

The existing README sends contributors to a file that no longer exists and documents a test command that cannot work as written. Fixing both keeps the first-run contributor experience accurate, avoids avoidable confusion during local validation, and aligns the README with the current repository layout.

Testing

Verified the referenced paths locally in the repository:

• .github/workflows/ exists and contains the active CI workflow files.
• tests/playTests.sh exists.
  No runtime checks were needed because this is a documentation-only change.

Risk

Low - documentation-only update that aligns README instructions with files already present in the repo.

[meta-cla]

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