Update README.md

fix: added table descriptions

feat: included corpus to bird val

fix: tracking everything with lfs

fix: explicitly track wal with git lfs

add: added corpus to be tracked by lfs

fix: fixed git attributes to track everything in the val databases folder

update: updated git attributes to track csvs and sqlites and the corpus validation json

Rename bird-corpus-val/bird-context-val.json to bird-corpus-val/bird-context-validation.json

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