First commit.
Set up the window and the root view controller.
Created custom header view class
Added a struct for the inter item spacing together with the make function. Added properties for number of columns and the spacing. Created a custom delegate that handles the item height, header height, footer height, and the section spacing
Implemented partially the simple layout.
Partially implemented view controller
Changed project settings.
Implemented sectioning.
Adjusted implementation with 3 sections
Merge branch 'master' of https://github.com/mownier/CollectionSample