Adding simple script to install Gogs as a Windows service.

scripts/windows/install-as-service.bat

@@ -0,0 +1,25 @@
+@ECHO off
+
+:: This script relies on nssm.exe to work.
+:: Please, download it and make it available on the system path,
+:: or copy it to the gogs path.
+:: https://nssm.cc/download
+:: This script itself should run in the gogs path, too.
+:: In case of startup failure, please read carefully the log file.
+:: Make sure Gogs work running manually with "gogs web" before running
+:: this script.
+:: And, please, read carefully the installation docs first:
+:: http://gogs.io/docs/installation
+:: To unistall the service, run "nssm remove gogs" and restart Windows.
+
+:: Set the folder where you extracted Gogs. Omit the last slash.
+SET gogspath=C:\gogs
+
+nssm install gogs "%gogspath%\gogs.exe"
+nssm set gogs AppParameters "web"
+nssm set gogs Description "A painless self-hosted Git service."
+nssm set gogs DisplayName "Gogs - Go Git Service"
+nssm set gogs Start SERVICE_DELAYED_AUTO_START
+nssm set gogs AppStdout "%gogspath%\gogs.log"
+nssm start gogs
+pause