renaming exercises

exercises/exerciseA/plot.py

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+import os
+import numpy as np
+import matplotlib.pyplot as plt
+
+# IO: This loads the timings for you 
+threads, timings = [], []
+for file in os.listdir('timings'):
+    with open(f'timings/{file}', 'r') as f:
+        n, t = f.read().strip().split(',')
+        threads.append(int(n))
+        timings.append(float(t))
+threads = np.array(threads)
+timings = np.array(timings)
+
+print('This is the data I loaded: threads =', threads, ', timings =',timings)
+
+fig, axs = plt.subplots()
+
+# CREATE YOUR PLOT HERE
+# Remember to label your axis
+# Feel free to make it pretty
+
+plt.savefig('threads_v_timings.png', dpi=300)