Add readme for updating resources

resources/README.md

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+Updating Resources
+==================
+
+This directory contains all external resources, like icons, used by Picard.
+
+Picard utilizes PyQt4 Resource System for using these resources in application. For more information about PyQt4 Resource System see this [documentation](http://pyqt.sourceforge.net/Docs/PyQt4/resources.html).
+
+For adding a new image into existing resources, follow these steps:
+
+1. Add image file (like .png) into `resources/images/` and source file (like .svg) into `resources/img-src`.
+2. Generate new .qrc file. This would automatically detect any changes in directory.
+
+    $ python2 makeqrc.py
+
+3. Create binary of all resources which will be used by Picard.
+
+    $ python2 compile.py