Prepare first release. (#18)

Author: MHenderson

NEWS.md

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+# processing-graph-streams (development version)
+
+# processing-graph-streams (v0.1.0)
+
+* Code matches the blog post: https://mjhdata.netlify.app/blog/processing-graph-streams/
+* Dependencies (graphviz) installed by install target.
+* Three example graphs in DOT format: Heawood graph, Frucht graph and Tutte graph.
+* gc example gvpr script.
+* Example of gc usage counting nodes and edges in three example graphs (make gc.txt).
+* colour gvpr script for adding colour information to the vertices of an input graph.
+* Example of colour usage in a pipeline using twopi from Graphviz to draw a coloured copy of the Frucht graph (make png/frucht.png).
+* Tested on Ubuntu 20.04.6 LTS (Focal Fossa) with graphviz version 2.43.0.