Edit typos and grammar and add python files

thinkcspy/Chapter-4-Exercises/Python-Files/problem5.py

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+# Runestone.Academy thinkcspy course
+# Chapter 4
+# Problem 5
+
+import turtle
+wn = turtle.Screen()
+avery = turtle.Turtle()
+avery.color("blue")
+dun = turtle.Turtle()
+dun.color("pink")
+elliot = turtle.Turtle()
+elliot.color("lime")
+missy = turtle.Turtle()
+missy.color("yellow")
+
+for i in range(3):
+    avery.forward(50)
+    avery.left(120) 
+    
+for i in range(4):
+    dun.backward(70)
+    dun.left(90)
+    
+for i in range(6):
+    elliot.left(60)
+    elliot.forward(40)
+    
+for i in range(8):
+    missy.right(45)
+    missy.backward(80)
+    
+wn.exitonclick()