Add main.py for Bill Split Calculator project

[shadowranger07]

Fix to Issue #192

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The Bill Split Calculator is a simple Python script that helps you calculate how much each person should pay when splitting a bill, including a specified tip percentage. It's a handy tool for determining the fair distribution of expenses when dining out with friends or sharing costs in a group setting.

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Checklist

• [x] I read the contributing guidelines
• [x] I structured my project as stated in the contributing guidelines
• [x] My project uses dependencies
• [x] I starred the repo
• [x] I had fun contributing!