Initial commit. Basic structure in place, need to implement logic.

src/kernel.rs

@@ -0,0 +1,11 @@
+mod constant;
+mod exponential;
+mod matern52;
+
+pub use constant::Constant;
+pub use exponential::Exponential;
+pub use matern52::Matern52;
+
+pub trait Kernel {}
+
+impl Kernel for Vec<Box<dyn Kernel>> {}