Added the create-keystone-app CLI argument documentation (#2278)

* Added support for --name and --adapter and fixed the --template CLI arguments

* Using strict string equality

* Added support for unattended app creation using CLI arguments

* Updated Keystone app generation documentation with the CLI arguments and sample commands (#2276)

* Reverted the manual version change. This should be done automatically using changesets

* Moved the create-app package argument documentation to the bottom of the README file

* Changeset for the keystone-create-app CLI arguments

.changeset/twenty-baboons-cheat.md

@@ -0,0 +1,6 @@
+---
+'create-keystone-app': patch
+'@keystonejs/website': patch
+---
+
+Added the documentation for the keystone-create-app CLI arguments (#2276)

docs/quick-start/README.md

@@ -50,6 +50,8 @@ You'll be prompted with a few questions:
 2. **Select a starter project.** Select the `Todo` application if you wish to follow this guide.
 3. **Select an adapter.** We'll go more into database adapters later. For now, simply choose `Mongoose` if you're running a MongoDB database and `Knex` if you're running a Postgres one.
 
+If you want to perform an unattended app generation (i.e. skipping the prompts), see the [CLI arguments](/packages/create-keystone-app/README.md) of the `create-keystone-app` utility script.
+
 Wait a few minutes for all the project dependencies to install. Once that's finished, run this:
 
 ```sh

packages/create-keystone-app/README.md

@@ -6,15 +6,45 @@ title: Create Keystone App
 
 # Create Keystone App
 
-A cli for Keystone 5 to help generate starter apps.
+A CLI for Keystone 5 to help generate starter apps.
 
 ## Usage
 
+### Interactive
+
 ```sh
 yarn create keystone-app my-app
 ```
 
-Follow the prompts, then:
+and follow the prompts.
+
+### Non-Interactive
+
+A non-interactive Keystone app creation could be useful in unattended app generation.
+One such example is creating a Docker image with a generated Keystone app built in.
+See the list of possible arguments in the **Arguments** section below.
+
+```sh
+npm init keystone-app --name "My App" --template "starter" --adapter "Mongoose" my-app
+```
+
+The app generation will fall back to interactive prompts if any of the arguments are
+missing or have incorrect values.
+
+**NOTE**: By the time this documentation was written, `yarn create` was not working
+because the CLI arguments were not passed to the `create-keystone-app` script.
+
+### Arguments
+
+| Argument     | Type      | Description                                                                                                                  |
+| :----------- | :-------- | :--------------------------------------------------------------------------------------------------------------------------- |
+| `--name`     | `String`  | The Keystone app name visible in the Admin UI and page titles.                                                              |
+| `--template` | `String`  | One of the existing app templates (folder name). For example: `starter`, `todo`, etc.                                       |
+| `--adapter`  | `String`  | One of the adapters listed in the app template. Usually one of: `Mongoose`, `Knex`.                                         |
+| `--dry-run`  | `Boolean` | Will go through the app generation process validating the user inputs or CLI arguments but in the end no app will be generated. |
+
+
+## Run the App
 
 ```sh
 cd my-app