Add doc.go files

ui/debug/doc.go

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+// Package debug contains utilities to display debug messages while running an interactive tview program.
+package debug

ui/doc.go

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+// Package ui contains the main gomuks UI.
+package ui

ui/types/doc.go

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+// Package types contains common type definitions used mostly by the UI, but also other parts of gomuks.
+package types

ui/widget/doc.go

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+// Package widget contains additional tview widgets.
+package widget