Add README, LICENSE and CHANGELOG

requirements.txt

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+# Core dependencies
+streamlit>=1.20.0
+pandas>=1.3.0
+numpy>=1.21.0
+matplotlib>=3.4.0
+plotly>=5.0.0
+scikit-learn>=1.0.0
+statsmodels>=0.13.0
+
+# Scientific computing (optional but recommended)
+scipy>=1.7.0
+
+# Streamlit extensions (optional)
+streamlit-autorefresh>=0.1.5
+
+# Additional utilities
+python-dateutil>=2.8.2
+pytz>=2021.3
+
+# For data processing
+openpyxl>=3.0.9  # For Excel file support
+xlrd>=2.0.1      # For older Excel files
+
+# Security/authentication
+cryptography>=3.4.7
+
+# Note: hashlib and json are part of Python standard library
+# Note: os and datetime are part of Python standard library