Update readme for new power up system

README.md

@@ -19,7 +19,9 @@ This is an implementation of the classic Asteroids game for the [Flipper Zero](h
 
 This is a screenshot, but the game looks a lot better in the device itself:
 
-![Asteroids for Flipper Zero screenshot](/images/Asteroids.jpg)
+![Asteroids for Flipper Zero screenshot](/images/Asteroids-PowerUps.png "In game screenshot")
+
+![Pause Screen](images/Pause%20Screen.png "Pause screen")
 
 # Controls:
 * Left/Right: rotate ship in the two directions.
@@ -32,6 +34,15 @@ This is a screenshot, but the game looks a lot better in the device itself:
 
 Your high scores will automatically be saved. Go forth and compete!
 
+---
+# Power Ups
+* ![](assets/firepower_shifted_9x10.png "Ammunition") - Machine gun fire. Press and hold OK button to fire more than the default 5 bullets
+* ![](assets/heart_10x10.png "Lives") - Et tu, Brute? Gives a bonus life up to a maximum of 5 lives
+* ![](assets/nuke_10x10.png "Nuke") - Nuke (work in progress). Destroys everything in sight (but keeps the power ups)
+* ![](assets/split_shield_10x10.png "Shield") - Use the force! Spins up a shield that can be used as a battering ram. Take zero damage while in use.
+
+## More power ups coming soon...
+
 ---
 ## Installing the binary file (no build needed)