feat(config): add 'describe' mode to config command for detailed parameter info

This commit adds a new 'describe' mode to the config command, allowing users
to get detailed information about configuration parameters. It includes:

1. New CONFIG_MODES.describe enum value
2. Functions to generate and print help messages for config parameters
3. Updated configCommand to handle the new 'describe' mode
4. README updates to document the new 'describe' functionality

README.md

@@ -114,7 +114,7 @@ OCO_TOKENS_MAX_INPUT=<max model token limit (default: 4096)>
 OCO_TOKENS_MAX_OUTPUT=<max response tokens (default: 500)>
 OCO_DESCRIPTION=<postface a message with ~3 sentences description of the changes>
 OCO_EMOJI=<boolean, add GitMoji>
-OCO_MODEL=<either 'gpt-4o', 'gpt-4', 'gpt-4-turbo', 'gpt-3.5-turbo' (default), 'gpt-3.5-turbo-0125', 'gpt-4-1106-preview', 'gpt-4-turbo-preview' or 'gpt-4-0125-preview' or any Anthropic or Ollama model or any string basically, but it should be a valid model name>
+OCO_MODEL=<either 'gpt-4o-mini' (default), 'gpt-4o', 'gpt-4', 'gpt-4-turbo', 'gpt-3.5-turbo', 'gpt-3.5-turbo-0125', 'gpt-4-1106-preview', 'gpt-4-turbo-preview' or 'gpt-4-0125-preview' or any Anthropic or Ollama model or any string basically, but it should be a valid model name>
 OCO_LANGUAGE=<locale, scroll to the bottom to see options>
 OCO_MESSAGE_TEMPLATE_PLACEHOLDER=<message template placeholder, default: '$msg'>
 OCO_PROMPT_MODULE=<either conventional-commit or @commitlint, default: conventional-commit>
@@ -133,6 +133,18 @@ Simply set any of the variables above like this:
 oco config set OCO_MODEL=gpt-4o-mini
 ```
 
+To see all available configuration parameters and their accepted values:
+
+```sh
+oco config describe
+```
+
+To see details for a specific parameter:
+
+```sh
+oco config describe OCO_MODEL
+```
+
 Configure [GitMoji](https://gitmoji.dev/) to preface a message.
 
 ```sh