adding in sample code

README.md

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+# Overview
+
+`cpp-bonjour` is meant to be a pure C++ library that one can use on MacOS (iOS not tested). It uses the stdlib `<dns_sd.h>`.
+
+
+# How to test
+1. Run the broadcaster.
+```sh
+cd broadcaster
+clang++ -o broadcaster main.cpp
+./broadcaster
+```
+You should see output of the service details of the service we are advertising.
+
+2. Scan for services
+
+```sh
+cd scanner
+clang++ -o scanner main.cpp
+./scanner
+```
+Having done this, the output should include the resolved service.