README: Add warning about project being abandoned

diff --git a/README b/README
index 60405e15f1edf6fb1147449bfc961664399d2b1d..e448f9d0a26a9126ad666a281b7d02104cc1ba49 100644 (file)
--- a/README
+++ b/README
@@ -7,6 +7,9 @@
 
 @section Introduction
 
+@warning This project is not maintained anymore, it is kept alive just to
+historical/educational reasons.
+
 @libevent is a popular API that provides a mechanism to execute a callback
 function when a specific event occurs on a file descriptor or after a
 timeout has been reached. Furthermore, @libevent also support callbacks due