Enhanced dataset card: tags, CTA, data availability table

Improve dataset card with tags and CTA

Add dataset documentation with cohort-based configuration

Add german_germany with 3 script type splits (75 samples)

Add english_united_states with 3 script type splits (75 samples)

Add english_nigeria with 3 script type splits (75 samples)

Add english_china with 3 script type splits (75 samples)

Add spanish_mexico with 3 script type splits (56 samples)

Upload README with dataset documentation

Upload german_germany_monologues with 25 samples

Upload german_germany_keywords with 25 samples

Upload german_germany_free_speech with 25 samples

Upload english_united_states_monologues with 25 samples

Upload english_united_states_keywords with 25 samples

Upload english_united_states_free_speech with 25 samples

Upload english_nigeria_monologues with 25 samples

Upload english_nigeria_keywords with 25 samples

Upload english_nigeria_free_speech with 25 samples

Upload english_china_monologues with 25 samples

Upload english_china_keywords with 25 samples

Upload english_china_free_speech with 25 samples

Upload spanish_mexico_monologues with 25 samples

Upload spanish_mexico_keywords with 6 samples

Upload spanish_mexico_free_speech with 25 samples

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