Update README.md

Author: zachary62

README.md

@@ -22,7 +22,7 @@ Pocket Flow is a [100-line](https://github.com/The-Pocket/PocketFlow/blob/main/p
 
 Get started with Pocket Flow:
 - To install, ```pip install pocketflow```or just copy the [source code](https://github.com/The-Pocket/PocketFlow/blob/main/pocketflow/__init__.py) (only 100 lines).
-- To learn more, check out the [documentation](https://the-pocket.github.io/PocketFlow/). To learn the motivation, read the [story](https://zacharyhuang.substack.com/p/i-built-an-llm-framework-in-just).
+- To learn more, check out the [video tutorial](https://youtu.be/0Zr3NwcvpA0) and [documentation](https://the-pocket.github.io/PocketFlow/)
 - Have questions? Check out this [AI Assistant](https://chatgpt.com/g/g-677464af36588191b9eba4901946557b-pocket-flow-assistant), or [create an issue!](https://github.com/The-Pocket/PocketFlow/issues/new)
 - 🎉 Join our [Discord](https://discord.gg/hUHHE9Sa6T) to connect with other developers building with Pocket Flow!
 - 🎉 Pocket Flow is initially Python, but we now have [Typescript](https://github.com/The-Pocket/PocketFlow-Typescript), [Java](https://github.com/The-Pocket/PocketFlow-Java), [C++](https://github.com/The-Pocket/PocketFlow-CPP) and [Go](https://github.com/The-Pocket/PocketFlow-Go) versions!