docs: add CommonJS basic example to README

[Hashim1999164]

Summary

• Adds a CommonJS version of the basic README example so it runs with node example.js without "type": "module" or a .mjs extension.
• Logs the retrieved value so a successful run is obvious.
• Fixes a small duplicate-word typo ("the the") in the client readiness note.

Fixes #2378

Test plan

• Skim the Basic Example section in the README rendered on GitHub
• Optionally run the CommonJS snippet against a local Redis on port 6379