Create README.md

Author: t83714

README.md

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+### Magda API docs website
+
+This repository hosts the API documentation content for the [Magda project](https://magda.io), served via **GitHub Pages** at:
+
+🔗 **Live site:** [https://magda-io.github.io/api-docs](https://magda-io.github.io/api-docs) 
+
+The content is built from [magda core repo main branch](https://github.com/magda-io/magda). 
+
+If you have a deployed version of Magda, you can access the API docs of the deployed version at path `/api/v0/apidocs/index.html`.
+
+## 📘 Structure
+
+The `main` branch contains static HTML files and is used as the source for GitHub Pages.
+
+```text
+.
+├── index.html            # Latest version of the API docs
+├── openapi.json     # OpenAPI spec
+├── openapi.json     # Swagger spec