[Template] Each experiment NuGet package should have a readme

### Describe the bug

Especially since most take a dependency on WinUI, we need to call out needing the resources like they do. We can also use a readme to point out the experiment link here (and directly to each experiment issue/discussion), etc...

### Steps to reproduce

```text
N/A
```

### Expected behavior

Installing comes with instructions.

### Screenshots

_No response_

### Code Platform

- [ ] UWP
- [ ] WinAppSDK / WinUI 3
- [ ] Web Assembly (WASM)
- [ ] Android
- [ ] iOS
- [ ] MacOS
- [ ] Linux / GTK

### Windows Build Number

- [ ] Windows 10 1809 (Build 17763)
- [ ] Windows 10 1903 (Build 18362)
- [ ] Windows 10 1909 (Build 18363)
- [ ] Windows 10 2004 (Build 19041)
- [ ] Windows 10 20H2 (Build 19042)
- [ ] Windows 10 21H1 (Build 19043)
- [ ] Windows 11 21H2 (Build 22000)
- [ ] Other (specify)

### Other Windows Build number

_No response_

### App minimum and target SDK version

- [ ] Windows 10, version 1809 (Build 17763)
- [ ] Windows 10, version 1903 (Build 18362)
- [ ] Windows 10, version 1909 (Build 18363)
- [ ] Windows 10, version 2004 (Build 19041)
- [ ] Other (specify)

### Other SDK version

_No response_

### Visual Studio Version

_No response_

### Visual Studio Build Number

_No response_

### Device form factor

_No response_

### Additional context

_No response_

### Help us help you

Yes, but only if others can assist.

ファイルやテストは指定されていません。まず、実験用 NuGet パッケージの定義を見つけ、パッケージのドキュメントが現在どのように含まれているかを確認してください。各実験パッケージが、手順、必要なリソース、およびその実験の issue またはディスカッションへのリンクとともにインストールされれば完了です。

索引モデルが issue の本文から書いたものです。