adding usernotes.md

usernotes.md

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+#### Notes from practical use
+
+##### Background: 
+* These should probably be merged into the wiki or readme
+* I am writing these as I discover how to use this library
+* YMMV
+
+##### Jupyter Notebook
+* Don't place the whole node in a single "cell"
+* For example, place the code for the callback in its own Jupyter Notebook Cell
+
+##### Jupyter Lab
+* So far I have not managed to get things to work with Jupyter Lab
+
+#### Ana- and Mini- Conda
+* After a lot of experimentation (Ubuntu 16.04) I have come to the conclusion that Anaconda and ROS don't play nice together
+* I wanted to avoid hacking with the default installation scripts for both
+* I found that if I install conda first then ros, or the other way around, things would fail
+* I am pretty sure it's because conda installs its own python and with two different pythons things get messed up.
+
+##### RosCore
+* Roscore is not automatically started
+* To make things work in Jupyter Notebook you will need to start roscore separately
+
+##### jr.subscribe()
+* Is the jupyter-ros equivalent to rospy.Subscriber
+* Sample: `jr.subscribe('/number', Int32, callback)`
+* It does the same thing, but, it captures console output that the callback might produce
+
+##### Don't put multiple nodes in one Notebook
+* Still investigating the threading model
+* But for now, it just doesnt work
+
+