docs: added official cookbook reference

Author: PeriniM

cookbook/README.md

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+## 📚 Official Cookbook
+
+Looking for examples and guides? Then head over to the official ScrapeGraph SDK [Cookbook](https://github.com/ScrapeGraphAI/scrapegraph-sdk/tree/main/cookbook)!
+
+The cookbook provides step-by-step instructions, practical examples, and tips to help you get started and make the most out of ScrapeGraph SDK.
+
+You will find some colab notebooks with our partners as well, such as Langchain 🦜 and LlamaIndex 🦙
+
+Happy scraping! 🚀