Convert README to markdown and update it

README.md

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+# Redmine Wiki Notes Plugin
+
+## Plugin installation
+
+1. Copy the plugin directory into the vendor/plugins directory
+
+2. Update your gems
+
+3. Restart Redmine
+
+## Usage
+
+The following macros are added:
+
+- note
+- tip
+- important
+- warning
+
+Which can be used in three ways:
+
+~~~
+{{note(Note with *wiki formatting*)}}
+
+{{note
+Alternately, you can put blocks of *wiki-formatted* text here.
+}}
+
+{{note(Or if you really want)
+You can do both...
+}}
+
+{{tip
+This is a tip
+}}
+
+{{warning
+Be carefull with :
+* razors
+* knifes
+* fire
+}}
+
+{{important
+This is important message. Heed my words.
+}}
+~~~
+
+![Screenshot](screenshot.png?raw=true "Screenshot")
+
+## Credits
+
+The icons and the stylesheet were taken from the DokuWiki Note-Plugin (© Olivier
+Cortès and others, https://www.dokuwiki.org/plugin:note (GPLv2)).
+
+For the contributors, please see the git commit log.
+
+## License
+
+This plugin is released under the GPLv2.
+

README.rdoc

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-= Redmine Wiki Notes Plugin
-
-== Plugin installation
-
-1. Copy the plugin directory into the vendor/plugins directory
-2. Restart Redmine
-
-== Usage
-
-The following macros are added:
-
-* note
-* tip
-* important
-* warning
-
-which can be used in one of three ways:
-
-   {{note(text with *wiki formatting*)}}
-
-   {{note
-   Alternately, you can put blocks of *wiki-formatted* text here.
-   }}
-
-   {{note(Or if you really want)
-   You can do both...
-   }}
-
-This displays a block in the wiki page with a corresponding
-icon and the specified text.
-
-== Credits
-
-The icons and the stylesheet were taken from the DokuWiki Note-Plugin ((c) Olivier
-Cortès and others, http://www.dokuwiki.org/plugin:note (GPLv2)).
-
-For the contributors, please see the git commit log.
-
-== License
-
-This plugin is released under the GPLv2.