Initial DialogView Implementation

[jvalkeal]

Opinionated dialog view having main content, and buttons.

┌─────────────────────────────┐
│        Main content         │
│                             │
│                             │
├─────────────────────────────┤
│          Buttons            │
└─────────────────────────────┘

• Main Content
• Buttons at bottom area
• Event when dialog is requested to get closed