If you want to contribute, you can add additional versions by setting the value in src/data/versions.csv from that version from FALSE to TRUE.
Then, edit src/data/blocks.csv and add data in the following format:
Block Name,block_id,Version Index
Where Block Name is the name of the block, block_id is the block name in snake_case and Version Index is the line of src/data/versions.csv that corresponds to the first version the block appeared in. After adding anything to this file, it must be sorted alphabetically by the Block Name.
Finally, please upload a render taken from Java Edition version history - Minecraft Wiki. Ensure that block renders are 32x32 in .png format, and item renders are 16x16 in .png format. They should be placed as src/assets/blocks/block_id.png.