docs: 📝 small readme update to point to install ultralytics/CLIP to avoid confusion

[onuralpszr]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updates the README install command to point users to the ultralytics/CLIP GitHub package instead of openai/CLIP to reduce confusion 📝

📊 Key Changes

• Replaces the GitHub install URL in README.md from openai/CLIP to ultralytics/CLIP
• Keeps the rest of the installation instructions unchanged

🎯 Purpose & Impact

• Helps users install the correct repository version ✅
• Reduces setup mistakes and support churn caused by installing the upstream OpenAI repo 🔧

[UltralyticsAssistant]

👋 Hello @onuralpszr, thank you for submitting a ultralytics/CLIP 🚀 PR! This is an automated message—an Ultralytics engineer will assist shortly. Please review the checklist below to help us merge smoothly 🧩

-✅ Define a Purpose: Clearly explain the purpose of your fix or feature in your PR description, and link to any relevant issues. Ensure your commit messages are clear, concise, and adhere to the project's conventions.
-✅ Synchronize with Source: Confirm your PR is synchronized with the ultralytics/CLIP main branch. If it's behind, update it by clicking the 'Update branch' button or by running git pull and git merge main locally.
-✅ Ensure CI Checks Pass: Verify all Ultralytics Continuous Integration (CI) checks are passing. If any checks fail, please address the issues.
-✅ Update Documentation: Update the relevant documentation for any new or modified features.
-✅ Add Tests: If applicable, include or update tests to cover your changes, and confirm that all tests are passing.
-✅ Sign the CLA: Please ensure you have signed our Contributor License Agreement if this is your first Ultralytics PR by writing "I have read the CLA Document and I sign the CLA" in a new message.
-✅ Minimize Changes: Limit your changes to the minimum necessary for your bug fix or feature addition. "It is not daily increase but daily decrease, hack away the unessential. The closer to the source, the less wastage there is." — Bruce Lee

For more guidance, please refer to our Contributing Guide. Don't hesitate to leave a comment if you have any questions. Thank you for contributing to Ultralytics! 🚀

[UltralyticsAssistant]

🔍 PR Review

_{Made with ❤️ by Ultralytics Actions}

PR is clean. The README install URL update aligns with the stated intent and doesn’t introduce issues.