[chore] add more to the readme

Author: icepuma

README.org

@@ -4,13 +4,18 @@
 
   will wait for a given domain to resolve to a given IP.
 
-  Examples:
+** Why?
 
+  You setup a new server, take the IP and let your example.com domain point towards it. Now you have to wait some time.
+  ~dnswait~ can help you with that task. It will notify you when the task is successfully done!
+
+** Examples
   #+BEGIN_SRC bash
     dnswait --domain ipv6.google.com --ip 2a00:1450:4002:80b::200e
     dnswait --domain reddit.com --ip 151.101.65.140
   #+END_SRC
 
+** Miscellaneous
   dnswait uses https://github.com/0xAX/notificator to support the following notifications:
 
   - Linux: ~notify-send~ or ~kdialog~