adjust README for propane

Author: monkstone

processing_app/library/sound/README.md

@@ -1 +1,10 @@
 ### README
+Remember you need to install processing sound library this way:-
+
+```bash
+propane --install Sound
+```
+
+To install other contributed libraries eg `minim` [see documentation][docs]
+
+[docs]:https://ruby-processing.github.io/propane/contributed

processing_app/library/video/README.md

@@ -1,6 +1,10 @@
-###README
+### README
+Remember you need to install processing video library this way:-
 
-You will need to install the video library from processing.org (since it is no longer included in the vanilla processing distro), this is easiest done from the processing ide, see the [Dan Shiffman video][] on video capture.
-[Dan Shiffman video]:http://vimeo.com/115436609
+```bash
+propane --install Video
+```
+
+To install other contributed libraries eg `minim` [see documentation][docs]
 
 NB: `captureEvent` and `videoEvent` both need the `video_event` library to be loaded (to access poxy java reflection methods).