Added readme mirroring plugin documentation

README.md

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+
+GfxBuilder Plugin
+-----------------
+
+Plugin page: [http://artifacts.griffon-framework.org/plugin/gfx-builder](http://artifacts.griffon-framework.org/plugin/gfx-builder)
+
+
+Brings the [GfxBuilder][1] on your Griffon application.
+
+Usage
+-----
+Refer to the [builder's][1] page to known what nodes are available.
+
+### Node
+
+The following nodes become available to Swing views
+
+| *None* | *Property* | *Type*  | *Required* | *Bindable* |
+| ------ | ---------- | ------- | ---------- | ---------- |
+| canvas | node       | GfxNode | false      | false      |
+
+The following is an example of its usage (copy & paste it on SwingPad)
+
+    canvas(preferredSize: [200,200]) {
+        group(borderColor: 'none') {
+            antialias true
+            background(color: color('white'))
+            rect(x: 50, y: 50, w: 100, h: 100, fill: color('red'))
+            rect(x: 100, y: 100, w: 100, h: 100, fill: color('green'))
+            path {
+                moveTo(x: 100, y: 100)
+                lineTo(x: 150, y: 150)
+                lineTo(x: 50, y: 200)
+                close()
+            }
+        }
+    }
+
+SwingPad can be found in the `samples` directory on your Griffon distribution.
+
+
+[1]: http://griffon.codehaus.org/GfxBuilder
+