Created the first version of the plugin


git-svn-id: svn://svn/integra/redmine-plugins/avoid_duplicated_name_in_projects_list@1 81a2ef57-70a4-4762-9a9d-c1e19331718a
Merge branch 'master' of github.com:integra-consultores/avoid-duplicated-name-in-projects-list