Revise Oxylabs Google News API trial information

Revise request sample and update documentation links

Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

Add files via upload

Update README.md

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Update README.md

Merge pull request #2 from oxylabs/scraper_implementation

Update README.md

Update README.md with additional instructions and screenshots