Occurence of an integer in a Linked List

[MeenakshiAM]

Description

This pull request fixes the issue #210 ... passed all testcases .
question:Given a singly linked list and a key, count the number of occurrences of the given key in the linked list.

Fixes: #210

Type of Change

• [ ✅] Question Added
• [✅ ] Solution Added

Checklist

• [✅ ] I have performed a self-review of my code.
• [✅ ] I have commented my code, particularly in hard-to-understand areas.
• [✅ ] I have made corresponding changes to the documentation (if applicable).
• [ ✅] My changes generate no new warnings.
• [ ✅] I have added tests to cover my changes (if applicable).
• [ ✅] All new and existing tests pass.

[github-actions]

Great job, @MeenakshiAM! Thanks for creating the pull request.
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