Add Windows installer creation script, mknsis.sh.
diff --git a/mknsis.sh b/mknsis.sh
new file mode 100755
index 0000000..b78cd61
--- /dev/null
+++ b/mknsis.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+PATH=$PATH:/usr/i686-pc-mingw32/sys-root/mingw/bin \
+ nsiswrapper --run \
+ --name "CPU miner" \
+ --outfile cpuminer-installer.exe \
+ minerd.exe