Hi all,

As a toy project I've written a simple ob-rust, mainly in order to prepare some simple demos using rust.

It works well for all the simple examples provided in the ob-rust-test.org file. Its shortcomings are
documented in the ob-rust.el file itself.

Since I'm not completely sure of the submission protocol for new features, the new file lives in
contrib for now, although it doesn't depend on anything outside of `ob' really so maybe it could be
added to core?

As far as testing is concerned, since I don't know how to use the database used by `org-test-at-id' I
hardcoded the name of the testing file, I'd be happy to change that if necessary.

Here's hoping this is useful for others, and since this is my first time writing anything functional
in elisp I'm gladly open for any hints to improve the code.

---
Andrés Saraos Luna