Update README.md

Update README.md

Update contributor list.

Add another batch of 400 images, 100 per category.

Update README.md

Update README to correspond to the new dataset size.

Fix typo.

Update annotations.json to include the new batch of images.

Add another batch of 400 map images.

Update README.

Upload verified annotations for the first batch of the images.

Upload first batch of thematic map images.

initial commit