Adds "Mississippi River" map

[RickD004]

Purpose

Adds "Mississippi River" map

Objectives

Funny map for v32

Add Mississippi river, inspired by Amazon, but vertical. Pipe-type map along Amazon and Passage. 11 nations, with 51 additional nations for a total of 62 for Humans vs Nations gamemode.

Description

https://github.com/user-attachments/assets/d289edf0-bc31-4521-882e-342753b9bf79
https://github.com/user-attachments/assets/67a9e718-ba9f-421c-bf1e-102803befc37

tri.star1011

[github-actions]

Hi @RickD004, thanks for opening this issue. It hasn't been approved by a maintainer yet — we'll get back to you shortly to either milestone it (approval) or close it.

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