Include additional details (motivation, citation, provenance etc.)

Add 101 language code table for translations (along with dialect codes)

Fill details for `dataset` section

Add `dataset_summary` and `dataset` sections

Add remaining metadata fields

Upload aya_header.png

Add language codes

uploading aya_human_annotated test split

uploading dolly_human_edited test split

uploading dolly_machine_translated test split

initial commit