some guidelines for contributors

doc/contrib.txt

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+How to contribute to lwIP
+
+Here is a short list of suggestions to anybody working with lwIP and 
+trying to contribute bugreports, fixes, enhancements, platform ports etc.
+First of all as you may already know lwIP is a volunteer project so feedback
+to fixes or questions might often come late.Hopefully the bug and patch tracking 
+features of savannah help us not lose users' input.
+
+
+The suggestions:
+
+- if you think you found a bug make sure it's not already filed in the bugtracker at savannah
+- if you have a fix put the patch on savannah.If it's a patch that affects both core and arch specific
+stuff please separate them so that the core can be applied separately while leaving the other patch 'open'
+The preffered way is to NOT touch archs you can't test and let maintainers take care of them.This is a good
+way to see if they are used at all - the same goes for unix netifs except tapif.
+- do not file a bug and post a fix to it to the patch area.Either a bug report or a patch will be enough.
+If you correct an existing  bug then attach the patch to the bug rather than creating a new entry in the patch area.
+- trivial patches (compiler warning, indentation and spelling fixes or anything obvious which takes a line or two)
+can go to the lwip-users list.This is still the fastest way of interaction and the list is not so crowded
+as to allow for loss of fixes.Putting bugs on savannah and subsequently closing them is too much an overhead
+for repoting a compiler warning fix.
+
+For platform porters:
+
+- if you've ported lwIP to a platform (an OS, a uC/processor or a combination of these) and you think it
+could benefit others[1] you might want to post an url to a tarball or zip from which it can be imported 
+to the contrib CVS module.Then you get CVS access and have to maintain your port :)
+
+
+[1] - lwIP CVS should not be just a place to keep your port so you don't have to set up your own CVS :)
+Especially welcome are ports to common enough OS/hardware that others can have access too.