Add chocolate cow

[AshfaqueFahim]

No description provided.

[github-actions]

🧪 PR Validation Results for #41

✅ Check PR is going to correct repo passed!
✅ Check image path passed!
❌ Image file images/chcolate-cow.jpg specified in cows/chocolate-cow.json does not exist in the PR.
❌ Image file is too large! Maximum allowed size is 200 KB. Please resize or compress it and update your PR.
❌ Image file name in cows/chocolate-cow.json should be based on the cow's name. Expected: images/chocolate_cow.png or .jpg or .jpeg
❌ File cows/chocolate-cow.json is not properly indented.
✅ Check line endings passed!

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❌ 3/7 passed. Please fix the issues above and update your PR.