Windows support

[bersbersbers]

I would find this incredibly helpful to verify correctness of my CuDNN installation, but it appears to me that the bazel code supports online Linux. (Please correct me if I am wrong.)

[chsigg]

Hi bersbersbers. You are correct, the build files currently only support Linux. Presumably it would only need a few tweaks to support Windows as well (adjusting library file names and paths using bazel's select("@bazel_tools//src/conditions:windows": [...], "default": [...])). I'm happy to take a PR if you want to give it a try.

[admud]

Hi, is this a good issue to work on for newcomers?