Onion Map

## Purpose
Add a new onion map

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## Objectives

- Add New Map, Onion to the game for use in Singleplayer and Custom lobbies.
- Add map to lobby rotation.

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## Description

**For a New Map**
- Small map
- 5 Nations
- Don't have images yet
- In a shape of a onion

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Display name 2TKTK1234567

tktk1234567 
