document version.h

Author: dgoffredo

src/datadog/version.h

@@ -1,5 +1,9 @@
 #pragma once
 
+// This component provides the release version of this library.
+// `tracer_version` is sent to the Datadog Agent with each trace, and is printed
+// to the log whenever `Tracer` is initialized.
+
 #include <string_view>
 
 namespace datadog {