Update README.md

[juliasloan25]

Purpose

small changes to readme

[kmdeck]

I believe @AlexisRenchon wants to add a few lines of code here showing how easy it is to setup and run a simulation! If so, that would be nice to include - either with him taking over this PR or in a followup PR.

(the changes you made look good, so I approved them)

[AlexisRenchon]

I will make a follow up PR!

[juliasloan25]

I have a PR open to set up and run a simple soil simulation in getting_started.md - maybe we can just point to that? #1267

[AlexisRenchon]

I think it's good for now to point to it.

For a readme, it seems a bit long, there's 100+ lines?

I like how oceananigans readme has a simulation setup in a few lines

using Oceananigans
grid = RectilinearGrid(CPU(), size=(128, 128), x=(0, 2π), y=(0, 2π), topology=(Periodic, Periodic, Flat))
model = NonhydrostaticModel(; grid, advection=WENO())
ϵ(x, y) = 2rand() - 1
set!(model, u=ϵ, v=ϵ)
simulation = Simulation(model; Δt=0.01, stop_time=4)
run!(simulation)

I think to have something equivalent we would need a even higher level API (with more defaults setup) and possibly less dependency via a module?

But that's just a thought. I am not suggesting to do anything for now. Pointing to the simple example in the docs is good! We can discuss further if it would be useful or not to have a even higher level API. Maybe MC3 workshop will tell if users want that.