[skip ci] Add readme to examples directory

examples/README.md

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+# Examples
+This folder contains examples showing how to use `async-stripe`. Each example
+is setup as its own crate so the dependencies are clear.
+
+The examples include:
+- `endpoints`: General usage, including API calls for commonly used resources, along
+    with examples of using different request strategies.
+- `pagination`: Async streaming of Stripe API calls which allow [Pagination](https://stripe.com/docs/api/pagination)
+- `webhook-actix`: Receiving Stripe webhooks using the web framework `actix-web`
+- `webhook-rocket`: Receiving Stripe webhooks using the web framework `rocket`
+- `webhook-axum`: Receiving Stripe webhooks using the web framework `axum`