Initial windows runtime work

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

cmd/ctr/kill_windows.go

@@ -0,0 +1,7 @@
+package main
+
+import "syscall"
+
+func parseSignal(rawSignal string) (syscall.Signal, error) {
+	return syscall.SIGKILL, nil
+}