add lefty, dotty, lneato to graphviz2 tree

diff --git a/cmd/lefty/os/mswin32/doinst b/cmd/lefty/os/mswin32/doinst
new file mode 100755 (executable)
index 0000000..4374379
--- /dev/null
+++ b/cmd/lefty/os/mswin32/doinst
@@ -0,0 +1,7 @@
+set -x
+
+if [[ $1 == '' || $1 == '-d' ]] then
+    cp -p debug/lefty.exe ../bin
+elif [[ $1 == '-a' ]] then
+    cp -p release/lefty.exe ../bin
+fi