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, 68 insertions, 0 deletions

diff --git a/docs/extensions/footnotes.txt b/docs/extensions/footnotes.txt
new file mode 100644
index 0000000..1d6593c
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+++ b/docs/extensions/footnotes.txt
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+title:      Footnotes Extension
+prev_title: Fenced Code Block Extension
+prev_url:   fenced_code_blocks.html
+next_title: Tables Extension
+next_url:   tables.html
+
+Footnotes
+=========
+
+Summary
+-------
+
+An extension to Python-Markdown that adds footnote syntax. This extension has 
+been included with Python-Markdown since 1.7 and should be available to anyone 
+who has a typical install of Python-Markdown.
+
+Syntax
+------
+
+Python-Markdown's Footnote syntax follows the generally accepted syntax of the 
+Markdown community at large and almost exactly matches [PHP Markdown Extra][]'s
+implementation of footnotes. The only differences involve a few subtleties in 
+the output.
+
+[PHP Markdown Extra]: http://michelf.com/projects/php-markdown/extra/#footnotes
+
+Example:
+
+    Footnotes[^1] have a label[^label] and a definition[^!DEF].
+
+    [^1]: This is a footnote
+    [^label]: A footnote on "label"
+    [^!DEF]: The definition of a footnote.
+
+A footnote definition may contain multiple lines, paragraphs, code blocks, 
+blockquotes and most any other markdown syntax. The additional line simply 
+must be indented at least an additional four spaces.
+
+    [^1]: The first paragraph of the definition.
+
+        Paragraph two of the definition.
+
+        > A blockquote with
+        > multiple lines.
+
+            a code block
+
+        A final paragraph.
+
+By default, the footnote definitions are placed at the end of the resulting 
+HTML document. However, you may want the footnotes in another location within 
+the document. Simply place the following text at that location within your 
+markdown document (See how to configure this text below):
+
+    ///Footnotes Go Here///
+
+Usage
+-----
+
+From the Python interpreter:
+
+    >>> html = markdown.markdown(text, ['footnotes'])
+
+To configure the place marker for footnote definitions (just be sure not to 
+use any existing markdown syntax):
+
+    >>> html = markdown.markdown(text, ['footnotes(PLACE_MARKER=+++my marker+++)'])
+