tips for compiling example code

Me and a few more users (at
https://groups.google.com/forum/#!topic/strophe/sPw7-Vpszxs) were struggling
to compile example files. I think this readme file will help others as well.

examples/README.md

@@ -0,0 +1,3 @@
+Compile example files with following gcc flags :
+=================================================
+``gcc -Wall -I/usr/local/include -L/usr/local/lib -o bot bot.c -lstrophe -lssl -lresolv -lexpat``