Create the Single-player Defeat Activity layout

[rachmiroff]

• [x] Create the Activity layout xml and Java source files.
• [x] Add the fundamental UI components to the layout file.
• [x] Position UI components according to the Figma storyboard file.
• [x] Provide placeholder text where appropriate.

[GonzoDen]

I've reviewed the changes, and everything seems to be in order. Well done!