Add more python solutions

Added python solutions for problems 19 and 20

Python/p019.py

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+#!/usr/bin/python3
+
+import datetime
+
+from timeit import default_timer
+
+def main():
+    start = default_timer()
+
+    count = 0
+
+    for year in range(1901, 2001):
+        for month in range(1, 13):
+            if datetime.datetime(year, month, 1).weekday() == 6:
+                count = count + 1
+
+    end = default_timer()
+
+    print('Project Euler, Problem 19')
+    print('Answer: {}'.format(count))
+
+    print('Elapsed time: {:.9f} seconds'.format(end - start))
+
+if __name__ == '__main__':
+    main()

Python/p020.py

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+#!/usr/bin/python3
+
+from math import factorial
+
+from timeit import default_timer
+
+def main():
+    start = default_timer()
+
+    n = str(factorial(100))
+
+    sum_ = 0
+
+    for i in range(len(n)):
+        sum_ = sum_ + int(n[i])
+
+    end = default_timer()
+
+    print('Project Euler, Problem 20')
+    print('Answer: {}'.format(sum_))
+
+    print('Elapsed time: {:.9f} seconds'.format(end - start))
+
+if __name__ == '__main__':
+    main()