Created snippet custom-exception-type.md

[mrcool7387]

Created Snippet for Custom Error/Exception Creation for Python

Type of Change

• [x ] ✨ New snippet
• 🛠 Improvement to an existing snippet
• 🐞 Bug fix
• 📖 Documentation update
• 🔧 Other (please describe):

Checklist

• [x ] I have tested my code and verified it works as expected.
• [x ] My code follows the style and contribution guidelines of this project.
• [x ] Comments are added where necessary for clarity.
• [x ] Documentation has been updated (if applicable).
• [x ] There are no new warnings or errors from my changes.

Related Issues

Closes #

Additional Context

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[majvax]

Those are the changes I think are necessary

[mrcool7387]

Those are the changes I think are necessary

Done