Update README.md

Author: ormesam

README.md

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 # Tracked
 
-An attempt to track stuff such as speed and jumps on a mountain bike using an android phone.
+**Tracked** is a mountain biking android application created with Xamarin Forms. The app allows you to record your mountain biking activity such as route, speed, airtime etc. and review it within the app.
 
-Want to test? drop me an email (details in profile) and I'll add you to the internal testers.
+For each ride the app can record the **route**, **speed**, **jump airtimes** and **trail times**. These factors are used to create a map of the ride and provide a visual way of seeing where they can improve. You can also earn achievements for hitting certain milestones during your ride. The main features are;
 
-Blog Post: https://medium.com/@samorme/mtb-mate-e158b2d13c2
+### Speed Heat Map
+
+![Speed Heat Map](media\speed-heat-map.jpg)
+
+This is the main feature of the app. It allows you to view your ride as a colour coded polyline on a map. Currently red is fastest and green is the slowest, the colours are relative to the top speed. A marker highlights the location of the top speed achieved on the ride.
+
+### Trails (Testing)
+
+![Trail](media\trail.jpg)
+
+Trails allow you to time yourself between two points and compare your results.
+
+### Jumps & Airtime (WIP)
+
+![Jumps](media\jumps.jpg)
+
+Tracked detects jumps using the devices accelerometer. It works by detecting when the device is in "freefall" and taking other factors into account, such as the speed. This feature is a work in progress.
+
+I'm always on the lookout for keen mountain bikers to help test the app! If you fancy giving it a go drop me an email (details in profile) and I'll add you to the internal testers.