add jobs page about researchsoftware.org

[danielskatz]

@sdruskat - I'm not quite sure how to do this in Jekyll - Can you provide any advice? (or even start a PR that I could build on?)

[sdruskat]

@danielskatz - I'll start a PR providing a skeleton that you can build on.

[sdruskat]

@danielskatz - I've now added a skeleton PR now in #93.
To add content, just edit jobs.md in the repository root.
To preview locally, you'd need a Ruby installation and Bundler.
In the repo root, run

1. bundle install to install dependencies and
2. bundle exec jekyll serve -w to run the build and serve the page at localhost:4000.

Let me know if you have any further questions. Happy to help.

[danielskatz]

Thanks @sdruskat - Can you take a look at what's there now? (I can't ask you to review formally, since it's your PR)