Update README.md with comprehensive model documentation

Upload IndoHoaxDetector models: Logistic Regression, SVM, Random Forest, Naive Bayes, TF-IDF vectorizer, and fine-tuned IndoBERT

Clarify that model detects hoax-style writing, not factual accuracy

Improve IndoHoaxDetector repo: add comprehensive README, model card, examples, evaluation script, tests, license, and fix app.py for hoax detection

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