Update README.md with additional setup instructions

- Added detailed setup instructions for new users.
- Clarified the installation process and prerequisites.
- Included examples for better understanding.
- Improved formatting for readability.

README.md

@@ -22,6 +22,27 @@ This dataset comprises a curated [Public Domain 12M](https://source.plus/pd12m)
 
 This dataset is derived and organized from [Spawning/PD12M](http://huggingface.co/datasets/Spawning/PD12M). The original license information for the image can be found in the corresponding entry of the original database.
 
+## Dataset Structure
+
+- id: A unique identifier for the image.
+- url: The URL of the image.
+- caption: A caption for the image.
+- caption_long: A long caption for the image.
+- origin_hash: The MD5 hash of the original image file.
+- origin_width: The width of the original image in pixels.
+- origin_height: The height of the original image in pixels.
+- origin_storage_id: The storage ID of the original image file.
+- processed_storage_id: The storage ID of the processed image file.
+- processed_width: The width of the processed image in pixels.
+- processed_height: The height of the processed image in pixels.
+- aspect_ratio: The aspect ratio of the image.
+- exif: The EXIF data of the image.
+- meta: The metadata of the image.
+- source: The source organization of the image.
+- vector: The vector embedding of the image.
+- created_at: The creation time of the image.
+- updated_at: The update time of the image.
+
 ## Uses
 
 This dataset is available for a wide range of applications.
@@ -80,6 +101,10 @@ copy is_pd12m FROM 'data/0000002.csv' CSV HEADER;
 
 3. Create Indexes
 
+You need to create the following indexes for the best performance.
+
+The `vector` column is a halfvec(1152) column, which is a 16-bit half-precision vector optimized for L2 indexing with [vectorchord](https://github.com/tensorchord/vectorchord). You can get more information about the vector index from the [vectorchord](https://docs.vectorchord.ai/vectorchord/usage/indexing.html) documentation.
+
 ```sql
 CREATE UNIQUE INDEX IF NOT EXISTS is_pd12m_url_index ON is_pd12m (url);
 CREATE INDEX IF NOT EXISTS is_pd12m_origin_width_index ON is_pd12m (origin_width);
@@ -105,5 +130,3 @@ CREATE INDEX IF NOT EXISTS is_pd12m_caption_index ON is_pd12m (caption) WHERE ca
 CREATE INDEX IF NOT EXISTS is_pd12m_caption_long_index ON is_pd12m (caption_long) WHERE caption_long = '';
 CREATE INDEX IF NOT EXISTS is_pd12m_vector_null_index ON is_pd12m (vector) WHERE vector IS NULL;
 ```
-
-## Dataset Structure