Add exercises that were initially left out

thinkcspy/Chapter-16-Exercises/Problem1_factorial.py

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+# Runestone.Academy thinkcspy course
+# Chapter 16
+# Problem 1
+
+def computeFactorial(number):
+    if number < 0:
+        return
+    elif number > 1:
+        number *= computeFactorial(number - 1)
+        return number
+    else:
+        return 1

thinkcspy/Chapter-16-Exercises/Problem2_reverseList.py

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+# Runestone.Academy thinkcspy course
+# Chapter 16
+# Problem 2
+
+def reverseList(lst):
+    if len(lst) == 1:
+        return lst
+    else:
+        lst = [lst[-1]] + reverseList(lst[:-1])
+        return lst

thinkcspy/Chapter-16-Exercises/Problem5_fibonacci.py

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+# Runestone.Academy thinkcspy course
+# Chapter 16
+# Problem 5
+
+def fibonacci(number):
+    if number < 0:
+        return
+    elif number == 0 or number == 1:
+        return number
+    else:
+        number = fibonacci(number - 1) + fibonacci(number - 2)
+        return number
+    
+print(fibonacci(10))