Georg Brandl  committed f3ac67e

Add a readme.

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+Mercurial codesmell extension
+This extension hooks in before commit and checks added lines for common
+"smelly" changes.  If it finds any, it will show them and prompt whether
+to continue committing.
+To enable, activate it in your hgrc file like this:
+    [extensions]
+    hgcodesmell = path/to/
+There is currently no other configuration you can set.
+Smelly patterns that are currently recognized are:
+* pdb.set_trace(), in Python files
+* 1/0, in Python files
+* print statements, in Python files
+  (I know this is going to produce false positives, but print statements
+  are also the debugging tool #1 for Python)
+* vim "quit" commands that leak into the file because of wrong mode
+* Windows newlines (only on non-Windows platforms)
+You can add more of them by editing's SMELLY_STUFF dictionary.
+This extension is copyright 2009, 2010 by Georg Brandl, and can be
+distributed under the GNU GPL version 2 or later.