Add screenshots to README

README.md

@@ -6,15 +6,30 @@ A web app for ranking items through pairwise comparisons using ELO and Glicko-2
 
 * Web UI for creating lists, voting and viewing rankings
 * Automatic metadata retrieval from URLs for comparison of products, movies, foods, etc.
+* Arrow key shortcuts for quick voting
 * ELO and Glicko-2 ranking algorithms
 * RESTful API
 
+## Screenshots
+
+### Example of pairwise comparison voting
+
+<p align="center">
+    <img src="images/voting.png" alt="Pairwise comparison of two King Gizzard & The Lizard Wizard albums" width="500">
+</p>
+
+### Example of the ranking results page
+
+<p align="center">
+    <img src="images/ranking.png" alt="Ranking results of King Gizzard & The Lizard Wizard albums" width="500">
+</p>
+
 ## Usage
 
 ### Docker
 
 ```
-wget "https://raw.githubusercontent.com/mpoc/ranker/master/docker-compose.yml"
+wget https://raw.githubusercontent.com/mpoc/ranker/master/docker-compose.yml
 docker-compose up -d
 ```