feat: Added New Company - Dropbox

[Ki-er]

This Pull Request should adhere to the repository's Code of Conduct.

Title your pull request descriptively. [edit X company] or [add new company - COMPANY]

Please read and check the boxes in the list below that apply!

If updating or adding a company, please include details here: delete this and add details

Check off this list as appropriate (add an x between the []). It will be used by @dougaitken when reviewing your contribution.

• [] You are an employee of the company mentioned and confirm all included details are correct.
• You know your alphabet - company is listed in alphabetical order in the README.md file.
• The company directly hires employees. ** No bootcamps / freelance sites / etc**
• The company hires remote employees, or positions are available to remote workers and are clearly illustrated as such.
• A company profile is included - This is required for new additions.
• An entry has been added or edited within the readme.md file.
• Remote status has details regarding how the culture includes remote employees, how the company integrated remote workers, etc
• Region details the geographic regions in which this company employees can reside. For more details see the instructions in the example company profile.
• How to apply details the best approach for new applications, page on site where open position are listed, and any other help available for job hunters

This is a modified version of the Contributing Guidelines.