Added readme instructions.

README.markdown

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+# devot:ee Widget for dashEE
+
+If you use the dashEE ExpressionEngine module and sell add-ons using devot:ee then this widget is for you. This widget displays a summary of all the sales you've made within the last 30 days.
+
+## Installation
+
+1.  Place the wgt.devotee.php file in the widgets folder of the dashEE module in your /system/expressionengine/third_party folder.
+
+2.  Update the dashEE language file located in the language/eng directory of the module by adding the following two lines:
+
+That's it. When you click the Widgets button from the dashboard you should now see the widget listed as an option.