added a dockerfile and readme for docker build

[ArshErgon]

Hey, I have added a docker file and a readme file for setting up the docker.
docker file runs on a small Linux distro "Alpine", it will help the users to run it locally in a vm.

DO NOT DELETE ANYTHING IN THIS COMMENT.
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• This PR contains housekeeping only (URL edits, copy changes etc) - if this is checked, delete other lines that don't apply
• 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

[dougaitken]

This might change soon as I want to move the whole site to Jekyll but I appreciate the contribution @ArshErgon

Can you add the contributing detail to https://github.com/remoteintech/remote-jobs/blob/main/.github/CONTRIBUTING.md instead, please? The main ReadMe file is informational for now.

[ArshErgon]

Don't worry I will be making a new Dockerfile when you will update the site to Jenkyll.
Sure, why not.