Add docs on contributing

CONTRIBUTING.md

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+# Contributing to netboot.xyz
+
+Thanks for supporting netboot.xyz, and for considering contributing to the
+project!
+
+## How to Contribute
+
+Because netboot.xyz supports many different operating systems and utilities, it
+takes work and time to keep the many options updated.  Distributions may add a
+new version of the operating system, locations of files can change, and versions
+might go end of life and drop off the mirrors.
+
+The end goal is to support as many operating systems as possible so that it's
+really easy to go explore new operating systems and tools from one location.
+
+## So what can I do to help?
+
+### Help keep netboot.xyz updated
+
+If you noticed one of your favorite operating system or tool has been updated,
+feel free to open a pull request to get the operating system updated.  It will
+be reviewed and merged once validated.
+
+### Add support for new OS and Utilities
+
+Do you have a favorite utility that you use often but isn't on netboot.xyz?
+Feel free to request it being added or submit a pull request.
+
+### Ask your distribution to become netboot friendly
+
+If you don't see support for your favorite distribution in netboot.xyz, please
+open up an issue with netboot.xyz and if possible, open up an issue with the
+distribution.
+
+Ask for the distribution to provide a way to load installer kernels from
+their mirror directly or provide key files from their release ISO somewhere that
+is accessible over HTTP.  This usually might be a vmlinuz, an initrd, and
+potentially a rootfs and could be extracted and hosted on the mirror when the
+release is generated.  Providing these allows not only netboot.xyz to load the
+installer from a supported and trusted location but also users to do the same
+from their own PXE servers.  In this day and age as physical media is less
+necessary, having the option to pull files as needed is much more efficient
+especially when you may have limited bandwidth.
+
+### Submit ideas
+
+I'm always looking for new ideas to make the tool more useful, if you have an
+idea, feel free to open up a Github Issue or open up a Pull Request.
+
+## Enjoy and have fun!