Adding CRUD for maps

correct text

adding error for notfound cases in maps

Maps added

Adding final pointers and errors

Adding pointer module with wallet example

Adding a shape and tests to check extensibility

Adding Shape Interface

Adding methods instead of funcs for Area and Perim

Adding Structs

Simple area and perimeter calc

Adding edge cases to prev slices func

Adding variadic function

Adding Tests and Benchmarks for Arrays and Slices

Array lab WIP