[Term Entry] C# Strings .Join()

[codecademy-docs]

Reason/inspiration (optional)

We would like a new entry on the .Join() term under the Strings concept in C#. The entry should go in a new file under content/c-sharp/concepts/strings/terms/join/join.md.

The entry should include:

• An introduction to the concept
• A Syntax section that provides the syntax for the concept
• An Example section that provides an example demonstrating the concept in use
• A Codebyte Example section that provides a codebyte example demonstrating the concept in use

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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[jkayk]

Can I work on this?