Add examples parallel_sum and sequential_sum

examples/parallel_sum.bend

@@ -0,0 +1,17 @@
+# Defines the function Sum with two parameters: start and target
+def Sum(start, target):
+  if start == target:
+    # If the value of start is the same as target, returns start.
+    return start
+  else:
+    # If start is not equal to target, calculate the midpoint (half),
+    # then recursively call Sum on both halves.
+    half = (start + target) / 2
+    left = Sum(start, half)  # (Start -> Half)
+    right = Sum(half + 1, target)
+    return left + right
+
+# A parallelizable sum of numbers from 1 to 1000000
+def main():
+  # This translates to (((1 + 2) + (3 + 4)) + ... (999999 + 1000000)...)
+  return Sum(1, 1_000_000)

examples/sequential_sum.bend

@@ -0,0 +1,14 @@
+# Defines the function Sum with two parameters: start and target
+def Sum(start, target):
+  if start == target:
+    # If the value of start is the same as target, returns start.
+    return start
+  else:
+    # If start is not equal to target, recursively call Sum with
+    # start incremented by 1, and add the result to start.
+    return start + Sum(start + 1, target)  
+
+def main():
+  # This translates to (1 + (2 + (3 + (...... + (999999 + 1000000)))))
+  # Note that this will overflow the maximum value of a number in Bend
+  return Sum(1, 1_000_000)