Add default app.png image

Author: SysC0mp

Plugins/HelloWorldFSharp/HelloWorldFSharp.fsproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>netcoreapp3.1</TargetFramework>
@@ -16,6 +16,9 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <Content Include="Images\app.png">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
     <Content Include="plugin.json">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </Content>