Rename docs/*.md => docs/*.txt

The documentation uses features of Python-Markdown that are not supported on
GitHub and it's better to get a source view of the docs anyway. For example,
that way comments and bug reports can reference a specific line of a file.

Of course, it makes sense for Github to render the README, so that is left
with the `.md` file extension.

1 files changed, 59 insertions, 0 deletions

diff --git a/docs/extensions/abbreviations.txt b/docs/extensions/abbreviations.txt
new file mode 100644
index 0000000..fa38f50
--- /dev/null
+++ b/docs/extensions/abbreviations.txt
@@ -0,0 +1,59 @@
+title:      Abbreviation Extension
+prev_title: Extra Extension
+prev_url:   extra.html
+next_title: Attribute List Extension
+next_url:   attr_list.html
+
+Abbreviations
+=============
+
+Summary
+-------
+
+The Markdown Abbreviation Extension adds the ability to define abbreviations. 
+Specifically, any defined abbreviation is wrapped in  an `<abbr>` tag.
+
+The Abbreviation extension is included in the standard Markdown library.
+
+Syntax
+------
+
+Abbreviations are defined using the syntax established in 
+[PHP Markdown Extra][php].
+
+[php]: http://www.michelf.com/projects/php-markdown/extra/#abbr
+
+Thus, the following text (taken from the above referenced PHP documentation):
+
+    The HTML specification 
+    is maintained by the W3C.
+        
+    *[HTML]: Hyper Text Markup Language
+    *[W3C]:  World Wide Web Consortium
+
+will be rendered like so:
+
+    <p>The <abbr title="Hyper Text Markup Language">HTML</abbr> specification 
+    is maintained by the <abbr title="World Wide Web Consortium">W3C</abbr>.</p>
+
+Usage
+-----
+
+From the Python interpreter:
+
+    >>> import markdown
+    >>> text = """
+    ... Some text with an ABBR.
+    ...
+    ... *[ABBR]: Abbreviation
+    ... """
+    >>> html = markdown.markdown(text, ['abbr'])
+
+To use with other extensions, just add them to the list, like this:
+
+    >>> html = markdown.markdown(text, ['abbr', 'footnotes'])
+
+Abbreviations can also be called from the command line using Markdown's `-x` 
+parameter, like so:
+
+    markdown.py -x abbr source.txt > output.html