normr 0.1.0

• Initial release
• Includes functions for shaping data, estimating reliability, and creating norm tables
• Functions to shape data for GAMLSS modeling shape_data() and composite_shape()
• Forward–backward selection with fb_select()
• Norm table creation with normtable_create()
• Reliability estimation with reliability_window() and different_rel()
• Plotting and visualization functions included: plot_normtable(), plot_Drel()