Add missing file

appveyor/requirements.txt

@@ -0,0 +1,12 @@
+# Fetch numpy and scipy wheels from the sklearn rackspace wheelhouse.
+# Those wheels were generated by @ogrisel by calling `wheel convert` on
+# the binaries from http://www.lfd.uci.edu/~gohlke/pythonlibs/
+# This is a temporary solution. As soon as numpy and scipy provide official
+# wheel for windows we ca delete this --find-links line.
+--find-links http://28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com/index.html
+
+# fix the versions of numpy to force the use of numpy and scipy to use the whl
+# of the rackspace folder instead of trying to install from more recent
+# source tarball published on PyPI
+numpy==1.8.1
+wheel