feat: added keyword codec (partially works)

README.md

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+# Marka
+
+Bidirectional mapping between Markdown and JSON (Schema.org-style) via small, declarative templates. Marka enables you to parse Markdown to JSON and render JSON back to Markdown using the same template.
+
+## Features
+
+*   **Bidirectional Mapping:** Convert Markdown to JSON and JSON to Markdown using a single template.
+*   **Declarative Templates:** Define your mappings with concise, easy-to-understand templates.
+*   **JSON Schema Validation:** Validate parsed JSON against Schema.org entities using JSON Schema.
+
+## Docker Image (CRUD API)
+
+A Docker image is available to transform a specified directory into a CRUD API. This allows you to expose your Markdown-to-JSON mappings as a web service.
+
+To run the Docker image:
+```bash
+docker run -p 8080:8080 -v /path/to/your/data:/app/data marka-crud-api
+```
+*(Replace `/path/to/your/data` with the absolute path to the directory you want to expose.)*
+
+## License
+
+This project is licensed under the [GNU General Public License v3.0](LICENSE.md).