Merge branch 'release/v0.1'

.gitignore

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+# Freeplane's map backup files
+*.mm.bak

README.md

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+# Freeplane "Desktop Actions" Addon
+
+This add-on provides a script to open or browse files, directories and URIs using the [java.awt.Desktop](https://docs.oracle.com/javase/8/docs/api/java/awt/Desktop.html) class: it looks for the associated application registered on the current platform, and launch it to handle the resource.
+
+## The "Open or browse resource.." action
+
+First, it tries to resolve the text contained in the selected node to an _URI_ resource or a _path_ (be it an _absolute_ or _relative_ referring to a _file_ or a _directory_).
+
+For example, consider the following directory tree:
+
+```
+svu.mm
+theme.mp3
+/images
+    benson.jpg
+    stabler.jpg
+```
+
+Then, the following scenarios apply for the `svu.mm` map:
+
+- Opening a node containing the text `images/benson.jpg` or `images/stabler.jpg` launches the default image viewer for our viewing pleasure.
+- Opening a node containing the text `theme.mp3` instead launches the default media player which plays that audio file, recommended.
+- Opening a node containing the text `https://en.wikipedia.org/wiki/Law_%26_Order:_Special_Victims_Unit` launches the default browser and displays the page.