Add GitHub source link

Author: hazzik

src/NHibernate.Driver.MySqlConnector/NHibernate.Driver.MySqlConnector.csproj

@@ -18,6 +18,9 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0">
+        <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
     <PackageReference Include="MySqlConnector" Version="0.63.0" />
     <PackageReference Include="NHibernate" Version="5.1.0" />
   </ItemGroup>