Update README.md

Author: HaoUNSW

PromptCast Generated Examples/README.md

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+Here, we provide some generated examples of language models under the PromptCast task setting.
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+With Pretrained: the results reported in Table 4.
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+train from scaracth: different training setting, the results reported in Table 6.
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+zero-shot: different training setting, the results reported in Table 6.
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+basic_prompt: prompt ablation study, the results reported in Supp.
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+minimum_prompt: prompt ablation study, the results reported in Supp.