Splay Sort Algorithm

[HetuKariya]

Description of Change

2872 resolved

Checklist

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

Notes: I have added Splay Sort Algorithm in cpp please merge it.

[HetuKariya]

Please merger this pr and give me hacktoberfest tag

[github-actions[bot]]

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