Add package readmes to illink NuGet packages stating SDK-only support (#123505) ## Description The `Microsoft.NET.ILLink` and `Microsoft.NET.ILLink.Tasks` NuGet packages are published but lack documentation indicating they're SDK-internal and unsupported for direct consumption. ## Changes - **Added `PACKAGE.md` files** to both packages with clear "Do not directly reference this package" language matching other SDK-internal packages like `Microsoft.NETCore.App` - **Enabled package readme inclusion** by removing `EnableDefaultPackageReadmeFile=false` from `ILLink.Tasks.csproj` and adding `EnableDefaultPackageReadmeFile=true` to `Mono.Linker.csproj` - **Included trimming documentation links** for users who need guidance on proper trimming usage through the SDK Both readmes follow the standard repository PACKAGE.md structure with About, How to Use, Additional Documentation, and Feedback sections.

Original prompt

> > ---- > > *This section details on the original issue you should resolve* > > Illink nuget packages should state support contract in package readme > The illink packages aren’t supported outside of use by the SDK. We should state that in the readme. > > ## Comments on the Issue (you are @copilot in this section) > > > >

- Fixes dotnet/runtime#123504 --- 💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more [Copilot coding agent tips](https://gh.io/copilot-coding-agent-tips) in the docs. --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: agocke <515774+agocke@users.noreply.github.com>

Illink nuget packages should state support contract in package readme #123504

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