README.md files added documenting the metadata dependencies and usage

otc_metadata/data/service_categories/README.md

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+# 📁 service_categories/
+
+Contains the list of service category definitions. These categories help group services (e.g., "Application", "Database").
+
+## 🔧 Example: `application.yaml`
+
+```yaml
+name: application
+title: Application
+```
+
+## Parameter Reference
+
+| Field   | Type   | Description                           |
+| ------- | ------ | ------------------------------------- |
+| `name`  | string | Internal identifier for the category. |
+| `title` | string | Display name used in UIs.             |