Add public post plan

doc/public_post_plan.md

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+
+Plan for a first public post/announcement.
+This week.
+
+Simple example:
+* Jupyter notebook to plot:
+    * subscription callback duration
+    * CPU cycles/callback
+* and resolve/demangle symbols
+* Include all files/scripts needed to get the result, but keep it simple
+* To be hosted somewhere
+* With some documentation/guide on how to try it out
+
+Post:
+* Mention that we're working on this
+* Talk about goals in general
+* Target = next release
+* Show off example
+* Invite people to ask questions/discuss
+
+Architecture considerations (right now but also later):
+* Try to use a dataframe as a ROS model abstraction, instead of first going through a layer with python data structures
+*