Mostly obsolete; use pyrxing instead

Author: dlenski

README.md

@@ -1,3 +1,14 @@
+| ⚠️ Mostly obsolete |
+| ----------------- |
+| The [zxing-cpp](https://github.com/zxing-cpp/zxing-cpp) and [rxing](https://github.com/rxing-core/rxing/)
+projects have reimplemented nearly all of the features of [ZXing](https://github.com/zxing/zxing) in C++ and
+Rust, respectively.\
+\
+The [pyrxing](https://github.com/tanagumo/pyrxing) project provides convenient Python
+bindings for them.\
+\
+You should probably use `pyrxing` instead of this one. It's faster and doesn't require Java in the background. |
+
 # python-zxing
 
 [![PyPI](https://img.shields.io/pypi/v/zxing.svg)](https://pypi.python.org/pypi/zxing)