Add scat.  Temporary fix to rc r.e. note groups.
diff --git a/sky/README b/sky/README
new file mode 100644
index 0000000..7bcdd97
--- /dev/null
+++ b/sky/README
@@ -0,0 +1 @@
+wget -O- http://pdos.lcs.mit.edu/~rsc/scat.tgz | gunzip | tar xf -