Edit typos and grammar and add python files

thinkcspy/Chapter-4-Exercises/Python-Files/problem10.py

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+# Runestone.Academy thinkcspy course
+# Chapter 4
+# Problem 10
+
+import turtle
+wn = turtle.Screen()
+
+wn.bgcolor("lightgreen")
+
+stella = turtle.Turtle()
+stella.color("blue")
+stella.shape("turtle")
+
+avery = turtle.Turtle()
+avery.color("blue")
+
+stella.up()
+avery.up()
+
+stella.stamp()
+
+for i in range(12):
+    stella.forward(100)
+    stella.stamp()
+    
+    avery.forward(70)
+    avery.down()
+    avery.forward(10)
+    avery.up()
+    
+    stella.forward(-100)    
+    avery.forward(-80)    
+    
+    stella.right(30)
+    avery.right(30)
+    
+wn.exitonclick()