Merge pull request #148 from DanielVandH/parameters2

Simpler initial example, also highlight parameters

Author: ChrisRackauckas

README.md

@@ -27,7 +27,20 @@ the documentation, which contains the unreleased features.
 
 ## Examples
 
-For basic multidimensional quadrature we can construct and solve a `IntegralProblem`:
+To perform one-dimensional quadrature, we can simply construct an `IntegralProblem`. The code below evaluates $\int_{-2}^5 \sin(xp)~\mathrm{d}x$ with $p = 1.7$. This argument $p$ is passed
+into the problem as the fourth argument of `IntegralProblem`.
+
+```julia
+using Integrals 
+f(x, p) = sin(x*p)
+p = 1.7
+prob = IntegralProblem(f, -2, 5, p)
+sol = solve(prob, QuadGKJL())
+```
+
+For basic multidimensional quadrature we can construct and solve a `IntegralProblem`. Since we are using no arguments `p` in this example, we omit the fourth argument of `IntegralProblem` 
+from above. The lower and upper bounds are now passed as vectors, with the `i`th elements of
+the bounds giving the interval of integration for `x[i]`.
 
 ```julia
 using Integrals