for the issue: [Entry] Variables: Creating new concept entry variables.md #4237

[zkhOlga]

Description

The new entry variables.md is created for Dart

Issue Solved

Closes #4237

Type of Change

• Adding a new entry under the path: docs/content/dart/concepts/variables/variables.md

Checklist

• [x] All writings are my own.
• [x] My entry follows the Codecademy Docs style guide.
• [x] My changes generate no new warnings.
• [x] I have performed a self-review of my own writing and code.
• [x] I have checked my entry and corrected any misspellings.
• [ ] I have made corresponding changes to the documentation if needed.
• [x] I have confirmed my changes are not being pushed from my forked main branch.
• [x] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• [ ] I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[ishg-153]

@zkhOlga How are the suggested changes coming along?

[ishg-153]

Due to lack of response from @zkhOlga I'm moving forward by making the changes

[github-actions[bot]]

👋 @zkhOlga You have contributed to Codecademy Docs, and we would like to know more about you and your experience. Please take a minute to fill out this four question survey to help us better understand Docs contributions and how we can improve the experience for you and our learners. Thank you for your help!

🎉 Your contribution(s) can be seen here:

https://www.codecademy.com/resources/docs/dart/variables

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