Include README correctly

Author: Saalvage

AssimpNet/AssimpNet.csproj

@@ -36,6 +36,7 @@
 
   <ItemGroup>
     <Content Include="..\logo.png" Link="nuget\logo.png" PackagePath="" />
+    <Content Include="..\README.md" Link="nuget\README.md" PackagePath="" />
     <Content Include="..\ChangeLog.txt" Link="nuget\ChangeLog.txt" PackagePath="" />
     <Content Include="..\License.txt" Link="nuget\License.txt" PackagePath="" />
     <Content Include="..\Docs\AssimpNet Documentation %28October 2018%29.chm" Link="nuget\AssimpNet Documentation %28October 2018%29.chm" PackagePath="" />
@@ -68,10 +69,6 @@
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <Link>runtimes\osx-arm64\native\%(Filename)%(Extension)</Link>
     </None>
-    <None Include="..\README.md">
-      <Pack>True</Pack>
-      <PackagePath>\</PackagePath>
-    </None>
   </ItemGroup>
 
   <!-- Copies Unity plugin files into a folder with Release build DLLs which can be drag n dropped into a unity project -->