Docs: New guide on config.yaml file (#2616)

documentation/docs/guides/config-file.md

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+---
+sidebar_position: 15
+title: Configuration File
+sidebar_label: Configuration File
+---
+
+# Configuration File
+
+Goose uses a YAML configuration file to manage settings and extensions. This file is located at:
+
+* macOS/Linux: `~/.config/goose/config.yaml`
+* Windows: `%APPDATA%\Block\goose\config\config.yaml`
+
+The configuration file allows you to set default behaviors, configure language models, and manage extensions. While many settings can also be set using environment variables, the config file provides a persistent way to maintain your preferences.
+
+## Global Settings
+
+The following settings can be configured at the root level of your config.yaml file:
+
+| Setting | Purpose | Values | Default | Required |
+|---------|---------|---------|---------|-----------|
+| `GOOSE_PROVIDER` | Primary LLM provider | "anthropic", "openai", etc. | None | Yes |
+| `GOOSE_MODEL` | Default model to use | Model name (e.g., "claude-3.5-sonnet", "gpt-4") | None | Yes |
+| `GOOSE_TEMPERATURE` | Model response randomness | Float between 0.0 and 1.0 | Model-specific | No |
+| `GOOSE_MODE` | Tool execution behavior | "auto", "approve", "chat", "smart_approve" | "smart_approve" | No |
+| `GOOSE_PLANNER_PROVIDER` | Provider for planning mode | Same as GOOSE_PROVIDER options | Falls back to GOOSE_PROVIDER | No |
+| `GOOSE_PLANNER_MODEL` | Model for planning mode | Model name | Falls back to GOOSE_MODEL | No |
+| `GOOSE_TOOLSHIM` | Enable tool interpretation | true/false | false | No |
+| `GOOSE_TOOLSHIM_OLLAMA_MODEL` | Model for tool interpretation | Model name (e.g., "llama3.2") | System default | No |
+| `GOOSE_CLI_MIN_PRIORITY` | Tool output verbosity | Float between 0.0 and 1.0 | 0.0 | No |
+| `GOOSE_ALLOWLIST` | URL for allowed extensions | Valid URL | None | No |
+
+## Example Configuration
+
+Here's a basic example of a config.yaml file:
+
+```yaml
+# Model Configuration
+GOOSE_PROVIDER: "anthropic"
+GOOSE_MODEL: "claude-3.5-sonnet"
+GOOSE_TEMPERATURE: 0.7
+
+# Planning Configuration
+GOOSE_PLANNER_PROVIDER: "openai"
+GOOSE_PLANNER_MODEL: "gpt-4"
+
+# Tool Configuration
+GOOSE_MODE: "smart_approve"
+GOOSE_TOOLSHIM: true
+GOOSE_CLI_MIN_PRIORITY: 0.2
+
+# Extensions Configuration
+extensions:
+  developer:
+    bundled: true
+    enabled: true
+    name: developer
+    timeout: 300
+    type: builtin
+  
+  memory:
+    bundled: true
+    enabled: true
+    name: memory
+    timeout: 300
+    type: builtin
+```
+
+## Extensions Configuration
+
+Extensions are configured under the `extensions` key. Each extension can have the following settings:
+
+```yaml
+extensions:
+  extension_name:
+    bundled: true/false        # Whether it's included with Goose
+    display_name: "Name"       # Human-readable name (optional)
+    enabled: true/false        # Whether the extension is active
+    name: "extension_name"     # Internal name
+    timeout: 300              # Operation timeout in seconds
+    type: "builtin"/"stdio"   # Extension type
+    
+    # Additional settings for stdio extensions:
+    cmd: "command"            # Command to execute
+    args: ["arg1", "arg2"]    # Command arguments
+    description: "text"       # Extension description
+    env_keys: []             # Required environment variables
+    envs: {}                 # Environment values
+```
+
+## Configuration Priority
+
+Settings are applied in the following order of precedence:
+
+1. Environment variables (highest priority)
+2. Config file settings
+3. Default values (lowest priority)
+
+## Security Considerations
+
+- Avoid storing sensitive information (API keys, tokens) in the config file
+- Use the system keyring for storing secrets
+- If keyring is disabled, secrets are stored in a separate `secrets.yaml` file
+
+## Updating Configuration
+
+Changes to the config file require restarting Goose to take effect. You can verify your current configuration using:
+
+```bash
+goose info -v
+```
+
+This will show all active settings and their current values.
+
+## See Also
+
+- [Environment Variables](./environment-variables.md) - For environment variable configuration
+- [Using Extensions](/docs/getting-started/using-extensions.md) - For more details on extension configuration
+- [Creating Plans](./creating-plans.md) - For information about planning mode configuration