Add first idea for rust api.

[windelbouwman]

Some ideas:

• change the rust crate into a library with some usage examples.
• Have two layers:
  1. C function prototypes
  2. A rustic api
• We might want to use bindgen?

[rossant]

Nice, thanks! a few notes:

• Having 2 layers seems like a good idea
• I would indeed suggest to use an automatic binding generator since the API is still changing a lot
• As you probably saw in the code, my approach so far with the Cython bindings has been to write a quick and dirty homemade binding generator: a Python script that parses the headers and generates the Cython bindings of the C functions. On top of that I manually write and maintain a second layer with a light Pythonic object-oriented interface. So, very similar to what you propose.
• It might make sense to coordinate so that the Pythonic/rustic/etc interfaces match as much as possible
• Note that I have 0 experience with Rust and I am therefore not familiar with best practices in this language