docs: Add the introduction to dds.

scribblings/dds.scrbl

@@ -3,7 +3,24 @@
 
 @title{dds: A Home-made Toolkit for Discrete Dynamical Systems in Racket}
 
-Welcome to my documentation: @racket[(list 'testing 1 2 3)].
+This is a toolkit for playing with various discrete dynamical systems in
+Racket.  A discrete dynamical system is a system which evolves from a discrete
+state to some other discrete states (many or one).  The systems are discrete in
+the sense that we can identify successive states with no other states in
+between.  Equivalently, the phase state of the system is discrete (and is often
+called the state graph).  These constraints imply the possibility of
+associating discrete, possibly branching timelines to any evolution of
+the system.
+
+@bold{DISCLAIMER:} I develop this toolkit as a support for my research on
+discrete dynamical systems.  The primary objective for this framework is to fit
+my approach to these systems.  Essentially, this framework should fit to the
+"shape of my mind", which is not necessarily the same as yours.
+
+This toolkit is designed with Emacs
+@hyperlink["https://orgmode.org/"]{Org-mode} interoperability in mind.
+
+dds currently includes the following modules:
 
 @table-of-contents[]