Added a prep file. Added instructions for creating test_dir

PART_1/prep

+#!/usr/bin/python
+
+import os
+
+def create_testdir():
+	current_directory = os.getcwd()
+	final_directory = os.path.join(current_directory, r'test_dir')
+	if not os.path.exists(final_directory):
+		os.makedirs(final_directory)
+
+def create_testfiles():
+	pass
+
+if __name__=="__main__":
+	create_testdir()
+	create_testfiles()