Hi! Thanks for checking out Julia. If you have questions or problems, the Julia dev list is a good place to post them, but you should check out the online Julia docs first. If you have changes you'd like to contribute, you'll need a free GitHub account. (If you're reading this on GitHub, you probably already have one.) You'll also want a working copy of Julia, built from source (you can still contribute with a binary install, but it's harder and not really recommended). In list form, here's what to do to become a contributor:
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Join the dev list.
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Create a GitHub account.
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Build the software and libraries (the first time takes a while, but it's fast after that). Detailed build instructions are in the README. Julia depends on several external packages; most are automatically downloaded and installed, but are less frequently updated than Julia itself.
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Keep Julia current. Julia is a fast-moving target, and many details of the language are still settling out. Keep your repository up-to-date and rebase your work in progress frequently.
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Relax and have fun.
The Julia team uses GitHub issues to track and discuss problems, feature requests, and pull requests.
You can make pull requests for incomplete features to get code review, in which case we have a convention of prefixing the pull request title with "RFC:" to indicate that the work is incomplete so it doesn't accidentally get merged into the master branch before it's ready.
Before submitting, make sure that all tests pass by running make testall. Even better, add your own tests for your change or feature to the test files in test/. If your contribution includes changes to Makefiles or external dependencies, make sure you can build Julia from a clean tree using git clean -fdx or equivalent (be careful – this command will delete any files lying around that aren't checked into git).
By contributing code to Julia, you are agreeing to release it under the MIT License.
While getting familiar with Julia, remember to check out the docs, keeping in mind that they are searchable. (If you use a script blocker then you'll have to unblock that page.) The source code is an excellent source of examples (and it's mostly pretty approachable). If you're still stumped, post something on the dev list, but you may want to search the archives first to see if there's already been a discussion about what you're stuck on.