Added screenshot to README.md

README.md

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 GeoMeteorites is an interactive visualization of the history of meteorites on Earth, using [D3](https://d3js.org/) and [Three.js](https://threejs.org/).
 It was developed in 2018 as a group project for the [EPFL](https://www.epfl.ch/en/) Data Visualization course (COM-480).
 
-<h3 align='center'><a href='https://raja-s.github.io/GeoMeteorites'>Try it out!</a></h3>
+<h1 align='center'><a href='https://raja-s.github.io/GeoMeteorites'>Try it out here!</a></h1>
+<p align='center'><a href='https://raja-s.github.io/GeoMeteorites'><img src='visualization-screenshot.png'/></a></p>
 
 A pre-recorded demo is also available [here](https://youtu.be/8MsuDOANd18).
 
 ## Data sources
 
 The following sources were used for the data:
 
-* The meteorites data (date, coordinates, composition) is from [this dataset](https://www.kaggle.com/datasets/nasa/meteorite-landings) collected by the Meteoritical Society and published by NASA.
+* The meteorites data (date, coordinates, composition) is from [this dataset](https://www.kaggle.com/datasets/nasa/meteorite-landings) collected by the Meteoritical Society and published by NASA
 * The mapping from coordinates to country was performed using [OpenStreetMap](https://www.openstreetmap.org) data
 * Information on notable meteoric events is taken from the [International Comet Quarterly](http://www.icq.eps.harvard.edu/meteorites.html)