Added a basic data download button

[anvithagowda098]

• [x] This pull request is on a separate branch and not the main branch
• [] I have tested my code with the xcodebuild and swiftlint --strict commands as directed in the testing section of the contributing guide

---

Description

Created a basic button for download data and linked it to DownloadDataVC. Button is yet to be linked to the storyboard.

Related issue

https://github.com/scribe-org/Scribe-iOS/issues/334

• #ISSUE_NUMBER: 334

[github-actions[bot]]

Thank you for the pull request! ❤️

The Scribe-iOS team will do our best to address your contribution as soon as we can. If you're not already a member of our public Matrix community, please consider joining! We'd suggest using Element as your Matrix client, and definitely join the General and iOS rooms once you're in. Also consider attending our bi-weekly Saturday dev syncs. It'd be great to meet you 😊

[github-actions[bot]]

Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• [ ] The linting and formatting workflows within the PR checks do not indicate new errors in the files changed

• [ ] The CI unit test workflows within the PR checks do not indicate new errors in the files changed

• [ ] The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)