Update Readme

Readme.md

 # Fast LISA Acronym lookup
 
-A simple script for Linux to look up LISA acronyms.
+A simple script for Linux to look up LISA acronyms. What is *LISA* again? Just install this script and run
+
+`$ lisaacro lisa`
+
+and you will know.
+
 
 The acronyms are fetched from <https://www.github.com/nluetzge/LISA_acronyms_dictionary>.
 
 ## Install
 
-`sudo make install`
+`$ sudo make install`
 
 (Or see `Makefile` on how to copy manually)