Updated README

README.md

@@ -3,6 +3,25 @@
 **An agent-based, socio-economic-ecological model of agricultural landscapes
 in Europe under the CAP.**
 
+## Description
+
+Persephone models farmers' decision making and its impact on species in agricultural
+landscapes. The aim is to investigate how policies such as the CAP influence farms and
+biodiversity.
+
+It is currently in the very early stages of development.
+
+## Usage
+
+Install the latest version of the [Julia](https://julialang.org/downloads/) programming 
+language. The recommended editors are [VSCode](https://www.julia-vscode.org/) or
+[Emacs](https://www.emacswiki.org/emacs/JuliaProgrammingLanguage).
+Then, open a Julia commandline and install the 
+[Agents.jl](https://juliadynamics.github.io/Agents.jl/stable/) framework using
+`using Pkg; Pkg.add("Agents")`.
+
+Run the simulation by executing `run.jl` from the commandline, or loading it from
+within a Julia REPL with `include("run.jl")`.
 
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