Mturk create-qualification-type [--test <value>] format

Confirm by changing [ ] to [x] below:
- [x] I've gone though the [User Guide](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-welcome.html) and the [API reference](https://docs.aws.amazon.com/cli/latest/reference/)
- [x] I've searched for [previous similar issues](https://github.com/aws/aws-cli/issues) and didn't find any solution

Issue is about usage on:
- [ ] Service API : I want to do X using Y service, what should I do?
- [x] CLI : passing arguments or cli configurations.
- [ ] Other/Not sure.

**Platform/OS/Hardware/Device**
What are you running the cli on?
- macOS Catalina 10.15.5
- aws-cli/2.0.16 Python/3.7.3 Linux/4.19.76-linuxkit botocore/2.0.0dev20

**Describe the question**

Using the requester sandbox `--endpoint-url https://mturk-requester-sandbox.us-east-1.amazonaws.com` I would like to create a qualification type with a test and answer key.

According to the documentation I can use 2 optional options `[--test ] and [--answer-key ]` (while not forgetting `--test-duration-in-seconds `).

https://awscli.amazonaws.com/v2/documentation/api/latest/reference/mturk/create-qualification-type.html

Using Qualification test and answer key require particular structures defined here:

https://docs.aws.amazon.com/AWSMechTurk/latest/AWSMturkAPI/ApiReference_QuestionFormDataStructureArticle.html

https://docs.aws.amazon.com/AWSMechTurk/latest/AWSMturkAPI/ApiReference_AnswerKeyDataStructureArticle.html

Is it possible to have an example how do you pass the content to the `aws mturk create-qualification-type ...` options:
- `--test `
- `--answer-key `

Thxs

AWS CLI の create-qualification-type リファレンスと、リンクされている QuestionFormData および AnswerKeyData 構造体のドキュメントから始めます。--test と --answer-key の値がどのように渡されるかを確認し、そのうえで requester sandbox エンドポイントで動作し、必要なテスト期間を含む完全なコマンド例をドキュメント化します。

索引モデルが issue の本文から書いたものです。