Add Go modules and missing vendored file

Author: rakyll

go.mod

@@ -0,0 +1,15 @@
+module github.com/google/gops
+
+go 1.12
+
+require (
+	github.com/StackExchange/wmi v0.0.0-20170410192909-ea383cf3ba6e
+	github.com/go-ole/go-ole v1.2.1
+	github.com/kardianos/osext v0.0.0-20170510131534-ae77be60afb1
+	github.com/keybase/go-ps v0.0.0-20161005175911-668c8856d999
+	github.com/shirou/gopsutil v0.0.0-20180427012116-c95755e4bcd7
+	github.com/shirou/w32 v0.0.0-20160930032740-bb4de0191aa4
+	github.com/xlab/treeprint v0.0.0-20180616005107-d6fb6747feb6
+	golang.org/x/sys v0.0.0-20171017063910-8dbc5d05d6ed
+	rsc.io/goversion v1.0.0
+)