Add RoboSharp.dll with Git LFS

- This is required to get the Github Action build to work.
- Commands to use Git LFS, executed in PowerShell:

```ps
git lfs install
git lfs track "*.dll"
git add -u -f .\Binaries\RoboSharp.dll .gitattributes
```

.gitattributes

@@ -0,0 +1 @@
+*.dll filter=lfs diff=lfs merge=lfs -text

ATxService/ATxService.csproj

@@ -55,8 +55,9 @@
       <HintPath>..\packages\NLog.4.3.11\lib\net45\NLog.dll</HintPath>
       <Private>True</Private>
     </Reference>
-    <Reference Include="RoboSharp">
-      <HintPath>..\..\robosharp\RoboSharp\bin\Release\RoboSharp.dll</HintPath>
+    <Reference Include="RoboSharp, Version=1.1.2.11, Culture=neutral, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\Binaries\RoboSharp.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Configuration" />