Add Chapter 9 exercises

thinkcspy/Chapter-9-Exercises/Python-files/Problem4.py

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+# Runestone.Academy thinkcspy course
+# Chapter 9
+# Problem 4
+
+# your code here
+
+num1 = 1
+product = 0
+
+for n in range(12):
+    num2 = 1
+    row = ""
+
+    for x in range(12):
+        product = num1 * num2
+        row += "{} \t".format(product)
+        num2 += 1
+
+    print(row)
+    num1 += 1