Update README

README.rst

@@ -1,2 +1,21 @@
 KiCAD Security Mesh Generator
 =============================
+
+.. image:: kicad-mesh-result-large.png
+   :width: 800
+   :alt: A screenshot of KiCAD showing a PCB security mesh generated by KiMesh.
+
+This repository contains KiMesh, a KiCAD pcbnew plugin that generates security mesh traces on a KiCAD PCB.
+
+Installation
+------------
+To install, copy the "kimesh" directory into your KiCAD installation's scripting plugin folder. Usually, this is
+`~/.config/kicad/scripting/plugins/` for KiCAD stable installations or `~/.config/kicad/5.99/scripting/plugins/` for
+nightly builds. On Windows, these paths can be found in your user account's `AppData/Roaming` directory.
+
+Theory of operation
+-------------------
+
+I have published a post_ on my blog on the theory of operation behind KiMesh.
+
+.. _post: https://blog.jaseg.de/posts/kicad-mesh-plugin/