R developer coding task

Welcome to the coding task for an R software developer. Here is the process:

1. Review the task. The problem is well described in specification_jaccard_index.md.
2. Pick a deadline for yourself and send it to us via e-mail hr+r@immunomind.io.
3. Fork the repository. In case you need GIT cheatsheet, here it is.
4. Provide solution by the deadline you've set for yourself.
5. Asking questions is a part of this task. Feel free to communicate, we'll be happy to help you.

We are available at hr+r@immunomind.io. All questions are welcomed. There's no such thing as a stupid question.