saeproj.multilevel 0.1.0

Initial CRAN Release

• Added sae_ml_linear() for small area estimation using a projection estimator with a multilevel regression model.
• Added a design-based residual correction for domain-level projection estimates.
• Added the simulated survey datasets saeml_modelsvy and saeml_projsvy.
• Added S3 methods for printing, summarising, and extracting domain-level estimates.
• Added a vignette describing the sae_ml_linear() workflow.