Add trace image generator

README.md

@@ -17,6 +17,13 @@ the simulation can be ran with:
 cargo run --bin anim
 ```
 
+Alternatively you can generate a trace image of the path the outer bob
+takes with:
+
+```
+cargo run --bin trace
+```
+
 ## License
 
 Copyright © Camden Dixie O'Brien, available under the Komorebi 2.0.0