Remove .md and image files and move python files into main chapter folders

thinkcspy/Chapter-6-Exercises/problem4.py

@@ -0,0 +1,32 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 4
+
+import turtle
+
+def drawSquare(t, sz):
+    """Get turtle t to draw a square of sz side"""
+
+    for i in range(4):
+        t.forward(sz)
+        t.left(90)
+
+wn = turtle.Screen()
+wn.bgcolor("lightgreen")
+
+alex = turtle.Turtle()
+alex.color("blue")
+alex.pensize(2)
+alex.speed(10)
+
+
+def drawCircleSquares(tt, num):
+    for i in range(num):
+        drawSquare(tt, 80)
+        tt.right(15)
+        
+
+drawCircleSquares(alex, 25)        
+        
+
+wn.exitonclick()