Add publish-unitsnet.bat

Convenient script to release a new nuget with a double-click
of the mouse.
Pulls in latest master, bumps the version and pushes the new
commit and tags so a new nuget is published by AppVeyor.

Author: angularsen

publish-unitsnet.bat

@@ -0,0 +1,19 @@
+@echo off
+call git checkout master
+if %errorlevel% neq 0 goto EXIT
+
+call git pull --rebase --prune
+if %errorlevel% neq 0 goto EXIT
+
+call build\bump-version-UnitsNet-minor.bat
+if %errorlevel% neq 0 goto EXIT
+
+call git push --follow-tags --set-upstream
+if %errorlevel% neq 0 goto EXIT
+
+echo.
+echo New version of UnitsNet pushed!
+
+:EXIT
+echo.
+pause