Added readme

README.md

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+# Among Us regionInfo.dat creator
+
+This is a simple python script to generate the regionInfo file needed for among us custom servers.
+
+## Basic usage:
+```sh
+python main.py "Server name" 169.0.0.1
+```
+this will generate a file called regionInfo.dat in your current folder, which could then be placed at `C:\Users\username\AppData\LocalLow\Innersloth\Among Us\regionInfo.dat`