Update README.md

Add note about successful use

README.md

@@ -5,6 +5,10 @@ This is a basic Kalman filter implementation in C++ using the
 directly as found in [An Introduction to the Kalman Filter]
 (http://www.cs.unc.edu/~welch/media/pdf/kalman_intro.pdf).
 
+This filter has been successfully used for the
+[Iron Dome](https://github.com/hmartiro/iron-dome), a robotic system
+which detects and intercepts dynamically thrown projectiles in fractions of a second.
+
 There is a test program that estimates the motion of a projectile based on
 noisy observations. To run it, use CMake: