Add guidelines and NuGet links

AGENTS.md

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+All documentation, branch names, variable and method names, and comments must use American English. Pull request titles and commit messages must also be in English.
+Do not create additional AGENTS.md files.
+Do not use the `--no-build` parameter when running the application or tests, as it leads to missing libraries.
+All tests should use xUnit with the FluentAssertions package.
+Information about available concurrent collections and methods is documented in README.md. Additional methods are distributed across NuGet packages.
+Before adding, modifying, or removing methods or classes, review the README files from related repositories.
+Projects and tests must target .NET 8 by default and also support .NET 9, .NET 7, and .NET 6. Use the latest available C# language features when possible.
+
+## NuGet packages
+- [Recyclable.Collections](https://www.nuget.org/packages/Recyclable.Collections)
+- [Recyclable.Collections.Compatibility.List](https://www.nuget.org/packages/Recyclable.Collections.Compatibility.List)
+- [Recyclable.Collections.Concurrent](https://www.nuget.org/packages/Recyclable.Collections.Concurrent)
+- [Recyclable.Collections.Linq](https://www.nuget.org/packages/Recyclable.Collections.Linq)
+- [Recyclable.Collections.Searching](https://www.nuget.org/packages/Recyclable.Collections.Searching)
+- [Recyclable.Collections.TestData](https://www.nuget.org/packages/Recyclable.Collections.TestData)
+- [Recyclable.Collections.TestData.xUnit](https://www.nuget.org/packages/Recyclable.Collections.TestData.xUnit)
+- [Collections.Benchmarks.Core](https://www.nuget.org/packages/Collections.Benchmarks.Core)