Add .gitattributes and CONTRIBUTING.md files

Created CONTRIBUTING.md to guide future contributors in following project procedures and conventions.

Author: SkalskiP

.gitattributes

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+*.ipynb linguist-vendored

CONTRIBUTING.md

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+## 🦸 Contributing to awesome-openai-vision-api-experiments 
+
+We love your input! We want to make contributing to awesome-openai-vision-api-experiments as easy and transparent as possible, whether it's:
+
+- Reporting a bug
+- Discussing the current state of the code
+- Submitting a fix
+
+## 🧪️ Adding a new experiment
+
+- **We only accept experiments where the code was open-sourced.**
+- Add new subdirectory to `experiments` directory.
+- Add new entry to `automation/data.csv` file.
+- Run `automation/script.py`. Experiments table in `README.md` will update 
+automatically.
+- Commit changes to feature branch. Create PR.