[Solr Wiki] Update of "HowToContribute" by HansHenrikRavn

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The "HowToContribute" page has been changed by HansHenrikRavn:
http://wiki.apache.org/solr/HowToContribute?action=diff&rev1=73&rev2=74

  Note that committers have to use [[http://apache.org/dev/committers.html#commit-403|https]] instead of http here, but http is fine for read-only access to the trunk code.
  
  If you prefer you could use the [[https://github.com/apache/lucene-solr|GitHub]] mirror instead.
+ 
+ == Exporting to a local repository ==
+ When making larger scale (please, try to keep your patches as small as humanly possible) changes, or when working in a team, you might want to be able to keep track of what you are doing locally. One way of doing so, is exporting to a local SVN repository. 
+ 
+ A proposed strategy for switching/exporting to a local SVN repository;
+  *	get the source from the repository (baseline)
+  *	export to local svn (local baseline)
+  *	loop
+   *	do work on local baseline (now work)
+   *	commit
+  *	draw a line    
+  *	do a (unix*) diff of local baseline <-> work (ignore anything that shouldn't go in the patch)
+  *	patch apache baseline
+  *	(unix) diff apache baseline <-> work (confirm is empty, or at least looking fine)
+  *	svn diff apache baseline, resulting in final patch
+ 
+ * by doing a unix diff, you keep any local version out of the patch file.
  
  == Making Changes ==
  Before you start, you should send a message to the [[http://lucene.apache.org/solr/mailing_lists.html|Solr developer mailing list]] (Note: you have to subscribe before you can post), or file a bug in [[http://issues.apache.org/jira/browse/SOLR|Jira]].  Describe your proposed changes and check that they fit in with what others are doing and have planned for the project.  Be patient, it may take folks a while to understand your requirements.