add postprocessing service

Signed-off-by: jkoberg <jkoberg@owncloud.com>

services/postprocessing/cmd/postprocessing/main.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"os"
+
+	"github.com/owncloud/ocis/v2/services/postprocessing/pkg/command"
+	"github.com/owncloud/ocis/v2/services/postprocessing/pkg/config/defaults"
+)
+
+func main() {
+	if err := command.Execute(defaults.DefaultConfig()); err != nil {
+		os.Exit(1)
+	}
+}