Fix doc builds on windows (#1409)

Signed-off-by: Marinov Avgustin <Avgustin.Marinov@bosch.com>

docs/install-theme.bat

@@ -0,0 +1,30 @@
+@echo off
+@REM
+@REM Copyright (c) 2018 Bosch Software Innovations GmbH and others.
+@REM
+@REM All rights reserved. This program and the accompanying materials
+@REM are made available under the terms of the Eclipse Public License v1.0
+@REM which accompanies this distribution, and is available at
+@REM http://www.eclipse.org/legal/epl-v10.html
+@REM
+
+rem This script checks if 'hugo' is installed. Afterwards, the Hugo theme is downloaded.
+
+hugo version
+if ERRORLEVEL 1 (
+    echo [ERROR] Please install Hugo first before proceeding.
+    exit 1
+)
+
+echo [INFO] 
+echo [INFO] Install Hugo Theme
+set HUGO_THEMES=themes\hugo-material-docs
+
+if not exist %HUGO_THEMES%\ (
+    git submodule add --force https://github.com/digitalcraftsman/hugo-material-docs.git %HUGO_THEMES%
+    echo [INFO] ... done
+) else echo [INFO] ... theme already installed in: %HUGO_THEMES%
+
+echo [INFO] 
+echo [INFO] Launch the documentation locally by running 'mvn site' (or 'hugo server' in the docs directory),
+echo [INFO] and browse to 'http://localhost:1313/hawkbit/'.