updated README and improved help message

README.md

@@ -6,3 +6,16 @@ A JSON-Getter written in D for bayernfahrplan
 
 bayernfahrplan is a tool wich lets you fetch departure tables from
 bayernfahrplan.de and output them as JSON.
+
+Usage
+-----
+
+```
+Usage: ./learncrypt [options]
+
+ Options:
+-f             --file The file that the data is written to.
+-s             --stop The bus stop for which to fetch data.
+-r --replacement-file The file that contais the direction name replacement info.
+-h             --help This help information.
+```

source/app.d

@@ -25,7 +25,7 @@ void main(string[] args)
 
     if (helpInformation.helpWanted)
     {
-        defaultGetoptPrinter("Some information about the program.", helpInformation.options);
+        defaultGetoptPrinter("Usage: ./learncrypt [options]\n\n Options:", helpInformation.options);
         return;
     }