chore: add docs, video preview, images

Signed-off-by: Sam Gammon <sam@elide.ventures>

Author: sgammon

README.md

@@ -2,6 +2,12 @@
 
 [Buildless][1], [Pkgst][8], [Turbo][2], and [React Native][3] with [sccache][4].
 
+> See [a video preview][13] of this sample on the command line
+
+| Uncached build (**22 seconds**) | Cached build (**1.5 seconds**) |
+| -------------- | ------------ |
+| <img src="docs/build-cli-clean.png" alt="Clean build" /> | <img src="docs/build-cli-repeat.png" alt="Cached build"> |
+
 
 ## Details about this sample
 
@@ -15,7 +21,7 @@ Together, these tools provide a unified cross-platform development environment,
 - [Turbo docs: Remote caching][9]
 
 
-## Using this example
+## Trying the sample
 
 > **Before you start:** Obtain an API key for [Buildless][1], set it at `BUILDLESS_APIKEY` in your environment
 
@@ -43,6 +49,21 @@ pnpm run android
 ```
 
 
+## Using the sample for your own codebase
+
+This is a [GitHub Template repository][10]; you can easily use it to create your own repo. Follow these steps to customize it
+for use with your Buildless account:
+
+1) Update `.github/CODEOWNERS`
+2) Add a [GitHub Secret][11] called `BUILDLESS_APIKEY`, set to the API key you want to use in CI
+3) That's it!
+
+
+### Sharing an API key across an organization
+
+You can use [Organization Secrets][12] to automatically provide a `BUILDLESS_APIKEY` to all your repos.
+
+
 ## Docs from the original template
 
 This template is a fork of [a similar Vercel-provided template][6]. The original README docs from that template are enclosed below.
@@ -69,6 +90,11 @@ This Turborepo has some additional tools already setup for you:
 - [Prettier](https://prettier.io) for code formatting
 
 
+## Video preview
+
+[![asciicast](https://asciinema.org/a/608260.svg)](https://asciinema.org/a/608260)
+
+
 [1]: https://less.build
 [2]: https://turbo.build
 [3]: https://reactnative.dev
@@ -78,3 +104,7 @@ This Turborepo has some additional tools already setup for you:
 [7]: https://docs.less.build/docs/turborepo
 [8]: https://docs.less.build/docs/pkgst
 [9]: https://turbo.build/repo/docs/core-concepts/remote-caching
+[10]: https://docs.github.com/en/repositories/creating-and-managing-repositories/creating-a-repository-from-a-template
+[11]: https://docs.github.com/en/actions/security-guides/using-secrets-in-github-actions
+[12]: https://docs.github.com/en/actions/security-guides/using-secrets-in-github-actions#creating-secrets-for-an-organization
+[13]: https://asciinema.org/a/608260