Add the DllImportResolver text the index.html

Also changed the .NET Standard version number to 2.0.

docs/index.html

@@ -20,7 +20,7 @@ <h2 id="project_tagline">Online documentation site for LibHeifSharp</h2>
     <div id="main_content_wrap" class="outer">
         <section id="main_content" class="inner">
             <p>LibHeifSharp provides .NET bindings for <a href="https://github.com/strukturag/libheif">libheif</a>.<br/>
-It is built against <a href="https://docs.microsoft.com/en-us/dotnet/standard/net-standard">.NET Standard 1.3</a>, and should work on any supported .NET platform that has a libheif shared library.</p>
+It is built against <a href="https://docs.microsoft.com/en-us/dotnet/standard/net-standard">.NET Standard 2.0</a>, and should work on any supported .NET platform that has a libheif shared library.</p>
     <p>The latest release can be downloaded from <a href="https://www.nuget.org/packages/LibHeifSharp/">NuGet</a> or from the <a href="https://github.com/0xC0000054/libheif-sharp/releases">Releases</a> page on GitHub.</p>
     <p>
       <a href="API/index.html">LibHeifSharp API Documentation</a>
@@ -40,7 +40,10 @@ <h3 id="features">Features</h3>
     <h3 id="sample-applications">Sample Applications</h3>
     <p>The <a href="https://github.com/0xC0000054/libheif-sharp-samples">libheif-sharp-samples</a> repository contains decoder and encoder samples that demonstrate the use of the library.</p>
     <h3 id="requirements">Requirements</h3>
-    <p>The libheif shared library must be named <code>libheif</code> in order for it to be found by P/Invoke.</p>
+    <p>The libheif shared library must be named <code>libheif</code> in order for it to be found by P/Invoke.<br/>
+On some platforms a <a href="https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.nativelibrary.setdllimportresolver">DllImportResolver </a>can be used to customize the loading of the <code>libheif</code> native library.<br/>
+See <a href="https://github.com/0xC0000054/libheif-sharp-samples/blob/main/src/common/LibHeifSharpDllImportResolver.cs">LibHeifSharpDllImportResolver.cs</a> in the libheif-sharp-samples repository for an example of this.
+    </p>
     <p>The minimum supported libheif version is 1.9.0.</p>
         </section>
     </div>