chore: include README file to NuGet package (#25)

Author: hazzik

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

@@ -9,6 +9,7 @@
     <Copyright>Licensed under LGPL.</Copyright>
     <PackageLicenseExpression>LGPL-2.1-only</PackageLicenseExpression>
     <PackageProjectUrl>http://nhibernate.info</PackageProjectUrl>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
     <PackageTags>nhibernate; mysqlconnector; mysql; mariadb;</PackageTags>
     <Description>NHibernate driver for MySQL/MariaDB using MySqlConnector.</Description>
     <RepositoryUrl>https://github.com/nhibernate/NHibernate.MySqlConnector</RepositoryUrl>
@@ -26,4 +27,8 @@
     <PackageReference Include="NHibernate" Version="5.1.0"/>
   </ItemGroup>
 
+  <ItemGroup>
+    <Content Include="../../README.md" PackagePath="/" />
+  </ItemGroup>
+
 </Project>