Add README and demo screenshot

README.md

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+# WhisperVis
+Whisper message propagation visualization.
+
+![demo](./demo.png)
+
+# Intro
+This tool visualizes message propagation in a p2p network using WebGL and helps building intuition about Whisper behaviour in different networks and/or settings.
+
+It takes two files as an input:
+
+ - `network.json` - network topology description, usually generated with [graph_generator](https://github.com/divan/graphs-experiments/tree/master/cmd/graph_generator) tool.
+ - `propagation.json` - propagation log, obtained via running [Whisper simulation tool](https://github.com/status-im/simulation).
+
+# Installation
+
+Assuming, you have Go installed and set up (why would you not?), just run:
+
+`go get github.com/status-im/whispervis`
+
+# Usage
+
+Place `network.json` and `propagation.json` into the folder with binary, and run it.
+
+`./whispervis`
+
+The output will show the URL where you should point your browser in order to see the visualization.
+
+# Contributing
+
+Project consists from two parts – Go backend and JS frontend, communicating via WebSockets.
+
+If you make a change in the frontend, you'll have to do a couple of things:
+
+  1. `cd web/ && npm install`
+  2. Run `go generate` to update the `bundle.js` which is used by the backend to serve a page.
+
+# License
+
+MIT
+