Add Chapter 6 python files and fix grammar issues in readme

thinkcspy/Chapter-6-Exercises/Python-files/problem5.py

@@ -0,0 +1,38 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 5
+
+import turtle
+
+def drawSquareSpiral(t, sz, num, angle):
+    """Get turtle t to draw a square of sz side"""
+    
+    for i in range(num):
+        t.forward(sz*i)
+        t.left(angle)
+
+wn = turtle.Screen()
+wn.setworldcoordinates(-300,-300,300,300)
+wn.bgcolor("lightgreen")
+
+
+alex = turtle.Turtle()
+alex.color("blue")
+alex.speed(0)
+alex.up()
+alex.goto(-150,0)
+alex.down()
+
+tess = turtle.Turtle()
+tess.color("purple")
+tess.speed(0)
+tess.up()
+tess.goto(150,0)
+tess.down()
+
+drawSquareSpiral(alex,2,100,90)
+
+drawSquareSpiral(tess,2,100,91)
+        
+
+wn.exitonclick()