Adding orbit_test

We did some live-coding to make a proof-of-concept
for how to get the electrons to orbit!

orbit_test.py

@@ -0,0 +1,27 @@
+from turtle import *
+from superturtle.animation import animate
+from superturtle.movement import restore_state_when_finished
+
+DOTSIZE = 10 
+
+def electron(radius):
+    """Assumes the turtle already has the proper heading. 
+    """
+    with restore_state_when_finished():
+        penup()
+        forward(radius)
+        pendown()
+        dot(DOTSIZE)
+
+for frame in animate(360, loop=True):
+    with frame.rotate(0, 359, cycles=2):
+        electron(100)
+        right(180)
+        electron(100)
+    with frame.rotate(0, 359):
+        electron(140)
+        right(180)
+        electron(140)
+
+input()
+