Add a few short snippets created for debugging

snippets/README.md

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+Here are a few short scripts which I created for testing. They are not
+representative of any kind of use, but help testing/debugging that the happy
+path works at least a bit.
+
+The `birdvisu` symlink is a quick hack, since the files were originally in the
+repository root and birdvisu had (has?) no packages created for it, so we need
+to be able to find the library somehow.

snippets/birdvisu

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+../birdvisu

snippets/test_diff.py

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+from birdvisu import maps
+
+with open('current.ospf') as actual:
+	act_topo = maps.Topology.from_ospffile(actual)
+with open('reference.ospf') as reference:
+	ref_topo = maps.Topology.from_ospffile(reference)
+
+diff = maps.TopologyDifference(act_topo, ref_topo)
+diff.compare()
+
+from pprint import pprint
+
+pprint(vars(diff))

snippets/test_ospffile.py

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+#!/bin/python3
+
+from birdvisu import ospffile
+from pprint import pprint
+
+with open('reference.ospf') as f:
+	loaded = ospffile.load(f)
+
+#pprint(loaded)
+
+print(ospffile.dumps(loaded))