Update README

Signed-off-by: Sampurna Pyne <sampurnapyne1710@gmail.com>

Author: Samk1710

README.md

@@ -1 +1,26 @@
-# aboutcode-mirror-euvd
+# EUVD Mirror
+
+This repository hosts an **append-only mirror** of the [European Vulnerability Database (EUVD)](https://euvd.enisa.europa.eu/search).
+
+## Sync Frequency
+
+The mirror syncs every day, appending new advisories from EUVD.  
+See the sync pipeline [sync_catalog.py](sync_catalog.py) and workflow 
+[.github/workflows/sync.yml](.github/workflows/sync.yml).
+
+
+## Usage
+
+To use the mirror, clone this repository:
+
+```bash
+git clone https://github.com/aboutcode-org/aboutcode-mirror-euvd
+```
+
+Once cloned, the advisories will be available in the `advisories/` directory organized by `datePublished`.
+
+
+## License
+
+* **Code** is licensed under the [Apache License 2.0](http://www.apache.org/licenses/LICENSE-2.0).
+* **Data** is licensed under [CC-BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).