Add some usage information to the project

README.adoc

@@ -3,3 +3,21 @@
 Logga is a simple, small, and fast logging library for Ada 2012. Unlike
 link:https://codelabs.ch/alog/index.html[Alog], which is very powerful and
 configurable, Logga aims for the most minimal runtime footprint possible.
+
+== Using
+
+Logga is very simple to use, but has a number of helpful functions which will help write faster logging code in Ada.
+
+[source, ada]
+----
+with Logga;
+
+procedure Main is
+   Log : constant Logga.Log_Type := (Level  => Logga.Info,
+                                     Colors => True);
+begin
+   Log.Info ("Hello World!");
+   Log.Debug ("This is a {1} message, with a magic number: {2}",
+              (Log.d ("tokenized"), Log.d (42)));
+end Main;
+----

src/logga.ads

@@ -43,7 +43,11 @@ package Logga is
    function d (L : in Log_Type;
                Token : in Integer) return Unbounded_String;
 
-   -- T is a small helper function to convert something to an suitable token
+   -- T is a small helper function to convert something to an suitable token for
+   -- output.
+   --
+   -- NOTE: This function is not optimized and will result in new string allocation
+   -- regardless of the log level.
    function T (Token : in String) return Unbounded_String;
    function T (Token : in Integer) return Unbounded_String;