BetaDanish 0.1.0

New features

Added density, distribution, quantile, random generation, survival, and hazard functions for the Beta-Danish distribution.
Added maximum likelihood estimation for complete and right-censored survival data.
Added support for the four-parameter Beta-Danish model and the three-parameter submodel.
Added model comparison tools using log-likelihood, AIC, BIC, and goodness-of-fit measures.
Added advanced survival modeling modules, including AFT regression, cure models, and competing risks analysis.
Added built-in benchmark datasets for survival and reliability applications.
Added diagnostic plotting methods, including survival, hazard, density, P-P, and Q-Q plots.

Added package-level documentation.
Added a vignette introducing the Beta-Danish modeling workflow.
Added README examples for installation, model fitting, model comparison, cure models, and diagnostic plotting.