add descratch readme

_examples/descratch/README.md

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+This is a more practical example. With sway you can move windows to
+a "scratchpad", i.e. like iconify it. There may be an official way
+to get back such windows, but I didn't find a good one. There's the
+"scratchpad show" command, but it doesn't allow you to select a
+window, it just shows the next one (and it keeps it in the floating
+state).
+
+So, this example program lists all windows currently garaged on the
+scratchpad. When called with a windows id, it gets back the window
+to the current workspace and gives it focus - thus descratching it.
+
+To add comfort to the process I  added a small script which you can
+use as a ui to it. It uses  rofi which makes a handy ui. To use it,
+compile descratch  with "go  build", copy  the descratch  binary to
+some location within your $PATH and run the script.