Add example directory readme

examples/README.md

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+# Hydrogen examples
+
+The example apps in this directory show how to implement popular design patterns in Hydrogen.
+
+Each example is a complete Hydrogen app, based on Hydrogen’s [Skeleton template](/templates/skeleton/), that you can inspect and run locally. See each example's README file for details on the problem it solves, how the solution works, and any other requirements you’ll need. Where possible we link to GitHub diffs
+
+Examples are kept intentionally minimal, containing only the required new and updated code to illustrate a working use case.
+
+## Popular examples
+
+These are some of the most commonly used Hydrogen examples. Browse the folders in this directory for the complete list.
+
+| Example                           | Details                                                                                                                                            |
+| --------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
+| [Multipass](/examples/multipass/) | Connect your existing third-party authentication method to Shopify’s customer accounts, so buyers can use a single login across multiple services. |
+
+## Request an example
+
+If you don’t see the example you’re looking for, you can [request one through the Discussions tab](https://github.com/Shopify/hydrogen/discussions/new?category=ideas-feature-requests&title=Hydrogen%20example%20request%3A%20%5BYour%20request%20here%5D%0A%0A).
+
+## Contributing examples
+
+Hydrogen is an open-source project, and we welcome your input! See the Hydrogen [contribution docs](/docs/examples/README.md) for more details on how to add your own examples to this repo.