Added Python program to check Armstrong number (#938)

[eswarseeram]

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📋 PR Details

Description of Changes:
Added a Python program to check whether a given number is an Armstrong number or not.
The program takes an integer input and verifies if the sum of its digits raised to the power of the number of digits equals the number itself.

Related Issues/Discussions:
Fixes #938

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📝 Contributor Info

Your Name:
Eswar Venkata Ram Charan Seeram

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✅ Checklist Before Submitting

• [ x ] I have checked the code for errors and ensured it follows the project's guidelines.
• [ x ] I have read the contribution guidelines.
• [ x ] I have participated in related discussions or created an issue if necessary.
• [ x ] I have included my name above.

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📣 Additional Comments

This Python script has been tested locally and provides correct output for sample inputs:
Input: 153 → Output: Armstrong number
Input: 125 → Output: Not Armstrong number
Added file under Python/armstrong_number.py.

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