[Entry] C++ unordered map: bucket_size()

[codecademy-docs]

Reason/inspiration (optional)

We would like a new entry on the term bucket_size() under unordered_map in C++. The entry should be in content/cpp/concepts/unordered-map/terms/bucket-size/bucket-size.md

The entry should include the following:

• A description of the term
• A ##Syntax section that includes the syntax of the method and its details
• An ##Example section that show an example of the current entry.
• An ## Codebyte section that have a compilable code inside it showing the current entry in use. Use ```codebyte/cpp to add compilable code.

Please refer to the term entry template, content standards and markdown style guide when working on the PR for this issue.

Entry Type (select all that apply)

New Term for Existing Concept Entry

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[anuj123upadhyay]

hey @codecademy-docs can you please assign this task to me, am ready to make a new entry on the term bucket_size() .

[mamtawardhani]

Hey @anuj123upadhyay I've just assigned an issue to you