Add linux installation instructions

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We want people to be able to develop ResearchEquals easily. The first step to do so is to make it manageable to get started with that - good installation instructions help reduce the barriers to do so.

We are looking for help to set up installation instructions for Linux. Given that different distro's use different package managers, we are open to doing instructions for the most common ones (e.g., apt, dnf, pacman).

We already have macOS instructions, which can be used as a reference of is required.
https://github.com/libscie/dev.researchequals.com?tab=readme-ov-file#guide