Known problems in version 0.14.0

[minghuaw]

• crates.io badge link to mlx-sys instead of mlx-rs (Remove unused submodule entry and updated badge url and docs url #94 )
• mlx-sys readme not updated
• docs.rs fails to build mlx-sys and mlx-rs
• argmax should also be a method of Array
• Add planned feature section in readme
• Better introduction docs
  • explains differences between _device and non_device variants
• Add docs for each mod
• Implement core::ops::Index and core::ops::IndexMut #97
• Use impl AsRef<T> if the arg only takes a reference #110
• Changecompile args to take impl Into<Option<_>>
• SIGSEGV caused by impl ScalarOrArray #106
• Split mlx_rs::ops::softmax to softmax and softmax_all #111
• vjp, jvp, grad, and value_and_grad don't take closure that returns Result<_, Exception> #113
• compile doesn't take closure that returns Result<_, Exception> #114
• compile a model #117