Adding Invasive Plants model

Author: jzkelter

.gitignore

@@ -258,6 +258,7 @@ target/
 /Sample Models/Biology/Fur.png
 /Sample Models/Biology/Heatbugs.png
 /Sample Models/Biology/Honeycomb.png
+/Sample Models/Biology/Invasive Plants.png
 /Sample Models/Biology/Membrane Formation.png
 /Sample Models/Biology/Moths.png
 /Sample Models/Biology/Muscle Development.png