docs: add comprehensive generate command reference (Resolves #2125)

Author: serfersac

docs/commands/generate.md

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+
+
+# asyncapi generate
+
+Generates code from AsyncAPI documents using AsyncAPI Generator templates.
+
+## Description
+
+The `asyncapi generate` command generates code from AsyncAPI documents using AsyncAPI Generator templates. This allows developers to quickly implement API clients, servers, documentation, and more based on their AsyncAPI specifications.
+
+The command supports three main subcommands:
+
+1. **Generate from template**: `asyncapi generate fromTemplate <asyncapi-spec> <template>`
+2. **Generate models**: `asyncapi generate models <asyncapi-spec>`
+3. **Generate client**: `asyncapi generate client <language> <asyncapi-spec>`
+
+## Common Options
+
+### For all subcommands:
+
+- `--output, -o <directory>`: Specify the output directory for generated code
+- `--install`: Install the template and its dependencies
+- `--force-write`: Force writing of generated files even if the output directory is not empty
+- `--param, -p <key=value>`: Additional parameters to pass to the template
+- `--map-base-url`: Maps all schema references from base URL to local folder
+- `--registry-url`: Specifies the URL of the private registry for fetching templates
+- `--registry-auth`: The registry username and password encoded with base64
+- `--registry-token`: The npm registry authentication token
+- `--no-interactive`: Disable interactive mode and run with provided flags
+- `--debug`: Enable more specific errors in the console
+
+## Common Flags
+
+| Flag | Description |
+|------|-------------|
+| `--output, -o` | Directory where generated code will be saved |
+| `--install` | Install the template and its dependencies |
+| `--force-write` | Force writing of generated files |
+| `--param, -p` | Additional parameters to pass to the template |
+| `--map-base-url` | Maps all schema references from base URL to local folder |
+| `--registry-url` | Specifies the URL of the private registry |
+| `--registry-auth` | The registry username and password encoded with base64 |
+| `--registry-token` | The npm registry authentication token |
+| `--no-interactive` | Disable interactive mode |
+| `--debug` | Enable more specific errors |
+
+## Examples
+
+1. Generate models from AsyncAPI specification:
+   ```bash
+   asyncapi generate models spec.yaml
+   ```
+
+2. Generate client for a specific language:
+   ```bash
+   asyncapi generate client javascript spec.yaml --param version=1.0.0 --output ./client
+   ```
+
+3. Generate code from template with specific parameters:
+   ```bash
+   asyncapi generate fromTemplate spec.yaml @asyncapi/html-template --param version=1.0.0 --output ./docs
+   ```
+
+4. Generate code with force-write option:
+   ```bash
+   asyncapi generate fromTemplate spec.yaml @asyncapi/html-template --force-write --output ./generated
+   ```
+
+5. Generate code with registry configuration:
+   ```bash
+   asyncapi generate fromTemplate spec.yaml @asyncapi/html-template --registry-url https://custom-registry.com --registry-token mytoken
+   ```
+