[Thrift Wiki] Update of "HowToContribute" by RogerMeier

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The "HowToContribute" page has been changed by RogerMeier:
http://wiki.apache.org/thrift/HowToContribute?action=diff&rev1=4&rev2=5

+ Moved to http://thrift.apache.org/docs/HowToContribute/
- = How to contribute =
-  1. Check if someone else has already begun work on the change you have in mind in the [[https://issues.apache.org/jira/browse/THRIFT| JIRA issue tracker]]
-  1. If not, create a ticket describing the change you're proposing in the issue tracker
-  1. Check out the latest version of the source code
-   * ''svn checkout http://svn.apache.org/repos/asf/thrift/trunk thrift-trunk''
-  1. Modify the source to include the improvement/bugfix
-   * Verify that you follow the same CodingStyle you see within the language you are working on
-   * Verify that your change works by adding a unit test.
-  1. Create a patch from project root directory (e.g. ''you@dev:~/thrift-trunk $'' ):
-   * ''svn add <any new file>''
-   * ''svn diff > ../THRIFT-XXX_my_new_feature.patch''
-  1. Attach the newly generated patch to the issue (please set the Attachment License to '''Grant license to ASF for inclusion in ASF works''')
-  1. Wait for other developers or committers to review it and hopefully +1 the ticket
-  1. Wait for a committer to commit it.