add placeholder of process on windows

process_windows.go

@@ -0,0 +1,14 @@
+// +build windows
+
+package gopsutil
+
+func Pids() ([]int32, error) {
+	ret := make([]int32, 0)
+
+	return ret, nil
+}
+
+func NewProcess(pid int32) (*Process, error) {
+	p := &Process{Pid: pid}
+	return p, nil
+}