Edit typos and grammar and add python files

thinkcspy/Chapter-4-Exercises/Python-Files/problem11.py

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+# Runestone.Academy thinkcspy course
+# Chapter 4
+# Problem 11
+
+import turtle
+wn = turtle.Screen()
+
+wn.bgcolor("black")
+
+stella = turtle.Turtle()
+stella.color("lightblue")
+stella.speed(10)
+
+avery = turtle.Turtle()
+avery.color("purple")
+avery.speed(10)
+avery.up()
+avery.right(90)
+avery.down()
+
+missy = turtle.Turtle()
+missy.color("purple")
+missy.speed(10)
+missy.up()
+missy.left(90)
+missy.down()
+
+dun = turtle.Turtle()
+dun.color("gold")
+dun.speed(10)
+dun.up()
+dun.left(90)
+dun.forward(30)
+dun.right(90)
+dun.down()
+
+for i in range(8):
+    stella.left(135)
+    stella.forward(-120)
+    
+    avery.right(45)
+    avery.forward(-50)
+
+for i in range(30, -32, -1):
+    missy.forward(i)
+    missy.left(20)
+
+dun.forward(120)
+dun.left(120)
+dun.forward(70)
+for i in range(2):
+    dun.left(120)
+    dun.forward(30)
+    dun.right(120)
+    dun.forward(30)
+dun.left(120)
+dun.forward(70)
+    
+wn.exitonclick()