APP-7171: Add README.md to module generate CLI

[michaellee1019]

Generates a base README.md for modules created with viam module generate. The template is inspired by our docs readme example. Meta.json is updated to have a relative link to the model level documentation of the readme. I adjusted the template with this feature in mind, attempting to reduce repetitive sentences "to configure a component/service go to..." and "This is a model that implements the ... API" so that the docs embedded in the app are to the point.

Tested the generator locally:
go run cli/viam/main.go module generate
Selected: "my-module-4", "test" namespace, Python, Arm Component, "my-model-4", Use CloudBuild, Register with Viam.

Generated markdown:

# Module my-module-4 

TODO: Provide a description of the purpose of the module and any relevant information.

## Model test:my-module-4:my-model-4

TODO: Provide a description of the model and any relevant information.

### Configuration
The following attribute template can be used to configure this model:

\`\`\`json
{
"attribute_1": <float>,
"attribute_2": <string>
}
\`\`\`

#### Attributes

The following attributes are available for this model:

| Name          | Type   | Inclusion | Description                |
|---------------|--------|-----------|----------------------------|
| `attribute_1` | float  | Required  | Description of attribute 1 |
| `attribute_2` | string | Optional  | Description of attribute 2 |

#### Example Configuration

\`\`\`json
{
  "attribute_1": 1.0,
  "attribute_2": "foo"
}
\`\`\`

### DoCommand

TODO: If your model implements DoCommand, provide an example payload of each command that is supported and the arguments that can be used. If your model does not implement DoCommand, remove this section.

#### Example DoCommand

\`\`\`json
{
  "command_name": {
    "arg1": "foo",
    "arg2": 1
  }
}
\`\`\`

Generated meta.json:

{
  "$schema": "https://dl.viam.dev/module.schema.json",
  "module_id": "test:my-module-4",
  "visibility": "private",
  "url": "",
  "description": "Modular arm component: my-model-4",
  "models": [
    {
      "api": "rdk:component:arm",
      "model": "test:my-module-4:my-model-4",
      "short_description": "Provide a short (100 characters or less) description of this model here",
      "markdown_link": "README.md#model-testmy-module-4my-model-4"
    }
  ],
  "entrypoint": "dist/main",
  "first_run": "",
  "build": {
    "build": "./build.sh",
    "setup": "./setup.sh",
    "path": "dist/archive.tar.gz",
    "arch": [
      "linux/amd64",
      "linux/arm64"
    ]
  }
}

[michaellee1019]

\`\`\`json

Ignore the backslashes here. Its generated without them. This was the way I could get the full markdown to render as a code block in the PR overview.