Update README.md

README.md

@@ -42,6 +42,19 @@ This dataset is derived and organized from [Spawning/PD12M](http://huggingface.c
 - origin_source: The origin source of the image.
 - license: The license of the image.
 
+## Prerequisite
+
+PostgreSQL 17 with extensions: [vectorchord](https://github.com/tensorchord/VectorChord) and [pg_search](https://github.com/paradedb/paradedb/tree/dev/pg_search)
+
+The easiest way is to use our [Docker image](https://github.com/Intelligent-Internet/II-Commons/tree/main/examples/db), or build your own. Then load the [psql_basebackup](https://huggingface.co/datasets/Intelligent-Internet/pd12m/tree/psql_basebackup) branch, following the [Quick Start](https://github.com/Intelligent-Internet/II-Commons?tab=readme-ov-file#quick-start) 
+
+Ensure extensions are enabled, connect to the database using the psql, and run the following SQL:
+
+```sql
+CREATE EXTENSION IF NOT EXISTS vchord CASCADE;
+CREATE EXTENSION IF NOT EXISTS pg_search CASCADE;
+```
+
 ## Uses
 
 This dataset is available for a wide range of applications.