Added a prelude

readme.md

@@ -34,10 +34,7 @@ For now, here is a simple example of using the propagator to solve a simple syst
 
 ```rust
 use nalgebra::Vector3;
-use differential_equations::integrator::dormand_prince::DormandPrince45;
-use differential_equations::controller::PIController;
-use differential_equations::callback::stop;
-use differential_equations::problem::*;
+use differential_equations::prelude::*;
 
 // Define the system (parameters, derivative, and initial state)
 type Params = (f64, bool);

src/lib.rs

@@ -6,16 +6,19 @@ pub mod controller;
 pub mod callback;
 pub mod problem;
 
+pub mod prelude {
+    pub use super::ode::ODE;
+    pub use super::integrator::dormand_prince::DormandPrince45;
+    pub use super::controller::PIController;
+    pub use super::callback::{Callback, stop};
+    pub use super::problem::{Problem, Solution};
+}
 
 #[cfg(test)]
 mod tests {
     use nalgebra::{Vector3, Vector6};
     use approx::assert_relative_eq;
-    use crate::integrator::dormand_prince::DormandPrince45;
-    use crate::controller::PIController;
-    use crate::callback::{Callback, stop};
-    use crate::ode::ODE;
-    use crate::problem::Problem;
+    use crate::prelude::*;
     use std::f64::consts::PI;
 
     #[test]