README: add table comparing to other Qt Rust bindings

Author: Be Wilson

README.md

@@ -120,6 +120,24 @@ mod ffi {
 }
 ```
 
+## Comparison to other Rust Qt bindings
+
+| Project | Integrate into C++ codebase  | Safe Rust | QML | QWidgets | Maintained<sup>1</sup> | Binding mechanism |
+|-------- | ---------------------------- | --------- | --- | -------- | ---------------------- | ----------------- |
+| CXX-Qt  |  ✔                           | ✔         | ✔ | limited<sup>2</sup> | ✔       | [cxx](https://cxx.rs) plus additional code generation to implement QObject subclasses in Rust and bind them to C++ |
+| [qmetaobject](https://github.com/woboq/qmetaobject-rs/) | ✗ | ✔ | ✔ | ✗ | ✔ | [cpp](https://github.com/mystor/rust-cpp) macro to write C++ inline in Rust, plus Rust macros to create QObject subclasses from Rust structs |
+| [Rust Qt Binding Generator](https://invent.kde.org/sdk/rust-qt-binding-generator) | ✔ | ✔ | ✔ | limited<sup>2</sup> | ✗ | generates Rust traits and C++ bindings from JSON description of QObject subclass |
+| [rust-qt](https://rust-qt.github.io/) | ✗ | ✗ | ✔ | ✔ | ✗ | [ritual](https://rust-qt.github.io/ritual/) to generate unsafe Rust bindings from C++ headers |
+| [qml-rust](https://github.com/White-Oak/qml-rust) | ✗ | ✔ | ✔ | ✗ | ✗ | [DOtherSide](https://github.com/filcuc/DOtherSide) C wrapper for QML C++ classes |
+| [qmlrs](https://github.com/flanfly/qmlrs) | ✗ | ✔ | ✔ | ✗ | ✗ | own C++ library to bind QQmlApplicationEngine |
+| [qmlrsng](https://github.com/nbigaouette/qmlrsng) | ✗ | ✔ | ✔ | ✗ | ✗ | [libqmlbind](https://github.com/seanchas116/libqmlbind) with [bindgen](https://rust-lang.github.io/rust-bindgen/) |
+| [rust-qml](https://github.com/florianjacob/rust-qml) | ✗ | ✔ | ✔ | ✗ | ✗ | [libqmlbind](https://github.com/seanchas116/libqmlbind) |
+
+<sup>1</sup>: maintained: supports Qt6 and repository has had nontrivial commits within last year as of August 2022
+
+<sup>2</sup>: CXX-Qt and Rust Qt Binding Generator can be used to implement custom QObjects subclasses in Rust. C++
+bindings for these QObject subclasses can be used in QWidgets applications, but these projects do not provide Rust
+bindings for QWidgets APIs.
 
 ## Contributing to CXX-Qt