ET0RadModels 1.0.0

• Initial release of the radiation-based ET0 models package.
• 10 radiation-based empirical ET0 models (Jensen-Haise, McGuinness-Bordne, Irmak, Makkink, Turc, Caprio, Abtew, Priestley-Taylor, Jones-Ritchie, Hargreaves 1975).
• FAO Penman-Monteith standard method as reference/base model.
• 9 statistical evaluation metrics (NSE, d, MSE, RMSE, NRMSE, MAE, MBE, r, R-squared).
• Visualization functions: scatter plots, Taylor diagrams, monthly comparison plots, annual bar charts.
• Sample meteorological dataset from a semi-arid region in India (Jhansi).
• Helper functions for solar geometry, vapor pressure, and other intermediate calculations.