adds simple python script example

example_simple_measurement.py

+import os
+import numpy as np
+import time
+os.chdir("/home/pi/OhmPi")
+from ohmpi import OhmPi
+
+### Define object from class OhmPi
+k = OhmPi()
+
+### Update settings if needed 
+k.update_settings({"injection_duration":0.2})
+
+### Set or load sequence
+k.sequence = np.array([[1,2,3,4]])    # set numpy array of shape (n,4)
+# k.set_sequence('1 2 3 4\n2 3 4 5')    # call function set_sequence and pass a string
+# k.load_sequence('ABMN.txt')    # load sequence from a local file
+
+### Run contact resistance check
+k.rs_check()
+
+### Run sequence
+k.run_sequence()   
+# k.interrupt()
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