correct extension for README file

README.md

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+= OpenProject Meeting Plugin
+
+This plugin adds functions to support project meetings. Meetings
+can be scheduled selecting invitees from the same project to take
+part in the meeting. An agenda can be created and sent to the invitees.
+After the meeting, attendants can be selected and minutes can be
+created based on the agenda. Finally, the minutes can be sent to
+all attendants and invitees.
+
+== Requirements
+
+The meetings plugin currently requires the OpenProject Core in
+version 3.0.0pre9 or newer.
+
+
+== Installation
+
+Please follow the default [plugin installation instructions for
+OpenProject](https://www.openproject.org/projects/openproject/wiki/Installation#222-Add-plugins),
+adding the following line to the Gemfile.plugins:
+
+`gem "openproject-meeting", :git => "https://github.com/finnlabs/openproject-meeting"`
+
+Afterwards, run:
+
+`bundle install`
+
+This plugin contains migrations. To migrate the database, run:
+
+`rake openproject_meeting:install:migrations`
+
+`rake db:migrate`
+
+== Deinstallation
+
+Remove the line
+
+`gem "openproject-meeting", :git => "https://github.com/finnlabs/openproject-meeting"`
+
+from the file `Gemfile.plugins` and run:
+
+`bundle install`
+
+== Bug Reporting
+
+If you find any bugs, you can create a bug ticket at
+
+`https://www.openproject.org/projects/plugin-meetings'
+
+== Development
+
+To contribute, you can create pull request on the official repository at
+
+`https://github.com/finnlabs/openproject-meeting`
+
+== Credits
+
+We would like to thank
+
+* Deutsche Telekom AG (opensource@telekom.de) for project sponsorhip
+* Birthe Russmeyer and Niels Lindenthal of finnlabs for their consulting and
+  project management
+
+== Licence
+
+(c) 2013 - Finn GmbH
+
+This plugin is licensed under the GNU GPL v3. See doc/COPYRIGHT.rdoc and
+doc/GPL.txt for details.