add link to CPPZMQ tour to README

Problem: a comprehensive documentation of cppzmq is missing from this repo. Solution: add a link to the very extensive tour of cppzmq by @brettviren.
zjlanhe · Oct 25, 2021 · d9a43fb · d9a43fb
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diff --git a/README.md b/README.md
@@ -92,6 +92,8 @@ See the `examples` directory for more examples. When the project is compiled wit
 API Overview
 ============
 
+For an extensive overview of the `zmq.hpp` API in use, see this [Tour of CPPZMQ by @brettviren](https://brettviren.github.io/cppzmq-tour/index.html).
+
 Bindings for libzmq in `zmq.hpp`:
 
 Types: