Add docs.

oi-sensor/README.md

+Optical Inspection Sensor.
+
+Setup and run inside virtual environment
+    ivan@shuttle-prod:~$ source osie-env/bin/activate
+    (osie-env) ivan@shuttle-prod:~$ pip install asyncua opencv-python
+    (osie-env) ivan@shuttle-prod:~$ cd osie/oi-sensor/
+    (osie-env) ivan@shuttle-prod:~$ python oi-sensor.py
+
+
+
+