create plot of time as a function of threads

exercises/exerciseA/plot.py

@@ -1,4 +1,5 @@
 import os
+import re
 import numpy as np
 import matplotlib.pyplot as plt
 
@@ -15,7 +16,10 @@ timings = np.array(timings)
 print('This is the data I loaded: threads =', threads, ', timings =',timings)
 
 fig, axs = plt.subplots()
-
+plt.scatter(threads, timings)
+plt.xlabel('Number of threads')
+plt.ylabel('Time (seconds)')
+#plt.show()
 # CREATE YOUR PLOT HERE
 # Remember to label your axis
 # Feel free to make it pretty