Started work on the Readme.md file

Started work on the Readme.md file for the basic documentation
on how to use BiaWeb2.

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+# Readme
+
+## Overview
+
+BiaWeb2 is a static site generator written in C++, that takes a directory tree 
+of documents (in Markdown format - more on that later) and outputs a website 
+with the same tree structure, based on a set of templates. 
+
+BiaWeb2 supports infinite nesting level of source sub-directories, with 
+each directory representing a "category". Thus, a website can have (say)
+a structure like
+    + Home
+      + ----- Blog
+      + ------+------ Travel
+      + ------+------ History
+      + ------+------ Personal
+      + ------+------ Technology      
+      + ----- Creative
+      + ------+------ Reviews
+      + ------+------ +------- Books
+      + ------+-------+--------+-------- Fiction
+      + ------+-------+--------+-------- Non-fiction
+      + ----- Miscellaneous
+
+Thus the entire structure of the website is represented by the filesystem
+hierarchy of directories (which I think is an intuitive way of organizing
+categories).
+
+`biaweb2` is a command-line program that performs the entire website 
+generation in one step. The usage is:
+
+    biaweb2 -i <inputdir> -o <outputdir> -t <templatedir> [-q]
+
+Where `<inputdir>` is the input directory, `<outputdir>` is the destination
+directory and `<templatedir>` is the location of the template files. The
+`templates` directory in the __biaweb2__ source package provides a default
+template that can be further customized to suit your needs. The main philosophy
+of BiaWeb2 is to be as configuration-free as possible and hence most of the 
+customization for a specific website is within the templates themselves. The
+option `-q` is quiet-mode, to suppress the messages. 
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