Added Binary Exponentiation Code

[xakep8]

fix: added binary exponentiation feat: used binary exponentiation test: add test for binary exponentiation docs: add comments and explanation to binary exponentiation algorithm/improve contributing guidelines chore: to do binary exponentiation.

Description of Change

Checklist

• [x] Added description of change
• [x] Added file name matches File name guidelines
• [x] Added tests and example, test must pass
• [x] Added documentation so that the program is self-explanatory and educational - Doxygen guidelines
• [x] Relevant documentation/comments is changed or added
• [x] PR title follows semantic commit guidelines
• [x] Search previous suggestions before making a new one, as yours may be a duplicate.
• [x] I acknowledge that all my contributions will be made under the project's license.

Notes:

[xakep8]

Please let me know if you need any changes to be made.

[xakep8]

request review from @ayaankhan98 and @mishraabhinn.

[xakep8]

@mishraabhinn and @ayaankhan98 I have deleted the dijkstra algorithm file as it was not up to the mark kindly review my code for binary exponentiation.

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