[Term Entry] Java ArrayList .contains()

[Codecademy-docs]

Reason/inspiration (optional)

Please add the .contains() method as a new term entry for ArrayList�. Provide the entry in a markdown file and place under the file path content/java/concepts/array-list/terms/

The entry should have the following:
� An introductory paragraph about what the method is and does.
� A syntax section with a pseudo code block with an explanation of it.
� An example showing the method in use.

Please refer to the term entry templates, 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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[Md Abid Hussain]

I would like to work on this issue

[Ishwari Garge]

@md-abid-hussain You're assigned!🎉You can look through the Contribution Guide to know more about contributing to Codecademy Docs. Check out the Content Standards and Style Guide, they’ll help you with creating your entry.

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