Add project documentation

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 classes and methods from the standard List and List<T> operations is documented in README.md. Additional compatibility methods are distributed across NuGet packages.
+Before adding, modifying, or removing methods or classes, review the README files from related repositories (links are included below).
+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.
+
+## Related NuGet packages
+- [Recyclable.Collections](https://github.com/mlemanczyk/Recyclable.Collections/blob/main/README.md)
+- [Recyclable.Collections.Compatibility.List](https://github.com/mlemanczyk/Recyclable.Collections.Compatibility.List/blob/master/README.md)
+- [Recyclable.Collections.Concurrent](https://github.com/mlemanczyk/Recyclable.Collections.Concurrent/blob/master/README.md)
+- [Recyclable.Collections.Linq](https://github.com/mlemanczyk/Recyclable.Collections.Linq/blob/master/README.md)
+- [Recyclable.Collections.Searching](https://github.com/mlemanczyk/Recyclable.Collections.Searching/blob/master/README.md)
+- [Recyclable.Collections.TestData](https://github.com/mlemanczyk/Recyclable.Collections.TestData/blob/master/README.md)

README.md

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-# Recyclable.Collections.Searching
+# Recyclable.Collections.Searching
+
+`Recyclable.Collections.Searching` is an open source project providing high performance search extensions for recyclable lists. The goal is minimal memory footprint and straightforward APIs.
+
+## Planned features
+- Search helpers for `RecyclableList<T>`
+- Search helpers for `RecyclableLongList<T>`
+
+## Related NuGet packages
+- [Recyclable.Collections](https://github.com/mlemanczyk/Recyclable.Collections/blob/main/README.md)
+- [Recyclable.Collections.Compatibility.List](https://github.com/mlemanczyk/Recyclable.Collections.Compatibility.List/blob/master/README.md)
+- [Recyclable.Collections.Concurrent](https://github.com/mlemanczyk/Recyclable.Collections.Concurrent/blob/master/README.md)
+- [Recyclable.Collections.Linq](https://github.com/mlemanczyk/Recyclable.Collections.Linq/blob/master/README.md)
+- [Recyclable.Collections.Searching](https://github.com/mlemanczyk/Recyclable.Collections.Searching/blob/master/README.md)
+- [Recyclable.Collections.TestData](https://github.com/mlemanczyk/Recyclable.Collections.TestData/blob/master/README.md)