Update README

Author: mciantyre

README.md

@@ -1,14 +1,48 @@
-### mciantyre/scipy-opencv-notebook Docker image
+## mciantyre/scipy-opencv-notebook Docker image
 
 All the fun of the [jupyter/scipy-notebook][jupyter-scipy-nb] Docker image, plus OpenCV 3.0.0, Python 3 bindings, and the OpenCV extra modules. Check out the [jupyter/scipy-notebook][jupyter-scipy-nb] for more information.
 
 Note: OpenCV was built with only Python 3 bindings. Therefore, Python 2 notebooks cannot `import cv2`.
 
-#### Doesn't this exist?
+## Getting started
+
+```
+docker pull mciantyre/scipy-opencv-notebook
+docker run -d -p 8888:8888 mciantyre/scipy-opencv-notebook
+```
+
+See [jupyter/scipy-notebook][jupyter-scipy-nb] for optional `run` arguments.
+
+Navigate to `localhost:8888` in any browser, and make your first Python 3 notebook! Here's a script to find a face in a picture that you upload:
+
+```python
+%matplotlib inline
+import numpy as np
+import matplotlib.pyplot as plt
+import cv2
+
+img = cv2.imread("your_uploaded_image.jpg")
+img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
+plt.imshow(img)		# shows face without box
+
+# If you need to find directories of data files,
+# open up a terminal window from the web interface and search from there
+#	find /opt -iname *haar*
+face_cascade = cv2.CascadeClassifier('/opt/opencv/data/haarcascades/haarcascade_frontalface_default.xml')
+
+faces = face_cascade.detectMultiScale(img, 1.3, 5)
+for (x,y,w,h) in faces:
+    cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
+    roi = img[y:y+h, x:x+w]
+
+plt.imshow(img)		# shows the face with a box around it
+```
+
+### Doesn't this exist?
 
 In a few places! But, I wanted to make my own for practice.
 
-Thanks to the [jupyter/docker-stacks][jupyter-stacks] project, OpenCV, and Docker. Made for the University of Pittsburgh DesignHub.
+Thanks to the [jupyter/docker-stacks][jupyter-stacks] project and the Jupyter team, OpenCV, and Docker. Made for the University of Pittsburgh DesignHub.
 
 [jupyter-scipy-nb]: https://github.com/jupyter/docker-stacks/tree/master/scipy-notebook
 [jupyter-stacks]: https://github.com/jupyter/docker-stacks