examples: add Interesting snippet tags to examples and link in Readme.md

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

examples/hellomaa.c

@@ -29,6 +29,8 @@
 int
 main(int argc, char **argv)
 {
+//! [Interesting]
     fprintf(stdout, "hello maa\n Version: %s\n", maa_get_version());
     return 0;
+//! [Interesting]
 }