Add placeholders to the OpenIddict, OpenIddict.AspNetCore and OpenIddict.Owin metapackages

src/OpenIddict.AspNetCore/OpenIddict.AspNetCore.csproj

@@ -19,4 +19,10 @@
     <ProjectReference Include="..\OpenIddict.Validation.DataProtection\OpenIddict.Validation.DataProtection.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Include="_._" Pack="true" PackagePath="lib\net461\_._" />
+    <None Include="_._" Pack="true" PackagePath="lib\netcoreapp2.1\_._" />
+    <None Include="_._" Pack="true" PackagePath="lib\netcoreapp3.1\_._" />
+  </ItemGroup>
+
 </Project>

src/OpenIddict.AspNetCore/_._

@@ -0,0 +1 @@
+

src/OpenIddict.Owin/OpenIddict.Owin.csproj

@@ -17,4 +17,8 @@
     <ProjectReference Include="..\OpenIddict.Validation.Owin\OpenIddict.Validation.Owin.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Include="_._" Pack="true" PackagePath="lib\net461\_._" />
+  </ItemGroup>
+
 </Project>

src/OpenIddict.Owin/_._

@@ -0,0 +1 @@
+

src/OpenIddict/OpenIddict.csproj

@@ -22,4 +22,12 @@ To use these features on ASP.NET Core or OWIN/Katana/ASP.NET 4.x, reference the
     <ProjectReference Include="..\OpenIddict.Validation.SystemNetHttp\OpenIddict.Validation.SystemNetHttp.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Include="_._" Pack="true" PackagePath="lib\net461\_._" />
+    <None Include="_._" Pack="true" PackagePath="lib\netcoreapp2.1\_._" />
+    <None Include="_._" Pack="true" PackagePath="lib\netcoreapp3.1\_._" />
+    <None Include="_._" Pack="true" PackagePath="lib\netstandard2.0\_._" />
+    <None Include="_._" Pack="true" PackagePath="lib\netstandard2.1\_._" />
+  </ItemGroup>
+
 </Project>

src/OpenIddict/_._

@@ -0,0 +1 @@
+