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, 63 insertions, 0 deletions

diff --git a/docs/extensions/index.txt b/docs/extensions/index.txt
new file mode 100644
index 0000000..82b0eda
--- /dev/null
+++ b/docs/extensions/index.txt
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+title:      Extensions
+prev_title: Command Line
+prev_url:   ../cli.html
+next_title: Extra Extension
+next_url:   extra.html
+
+
+Available Extensions
+====================
+
+Python Markdown offers a flexible extension mechanism, which makes it possible 
+to change and/or extend the behavior of the parser without having to edit the 
+actual source files. 
+
+To use an extension, pass it's name to markdown with the `extensions` keyword.
+See the [Library Reference](../reference.html#extensions) for more details. 
+
+    markdown.markdown(some_text, extensions=['extra', 'nl2br'])
+
+From the command line, specify an extension with the `-x` option. See the 
+[Command Line docs](../cli.html) or use the `--help` option for more details.
+
+    python -m markdown -x extra input.txt > output.html
+
+Officially Supported Extensions
+-------------------------------
+
+The extensions listed below are included with (at least) the most recent release
+and are officially supported by Python-Markdown. Any documentation is 
+maintained here and all bug reports should be made to the project. If you 
+have a typical install of Python-Markdown, these extensions are already 
+available to you.
+
+* [Extra](extra.html)
+    * [Abbreviations](abbreviations.html)
+    * [Attribute Lists](attr_list.html)
+    * [Definition Lists](definition_lists.html)
+    * [Fenced Code Blocks](fenced_code_blocks.html)
+    * [Footnotes](footnotes.html)
+    * [Tables](tables.html)
+    * [Smart Strong](smart_strong.html)
+* [CodeHilite](code_hilite.html)
+* [HTML Tidy](html_tidy.html)
+* [HeaderId](header_id.html)
+* [Meta-Data](meta_data.html)
+* [New Line to Break](nl2br.html)
+* [RSS](rss.html)
+* [Sane Lists](sane_lists.html)
+* [Table of Contents](toc.html)
+* [WikiLinks](wikilinks.html)
+
+Third Party Extensions
+----------------------
+
+Various individuals and/or organizations have developed extensions which they
+have made available to the public.  A [list of third party 
+extensions](https://github.com/waylan/Python-Markdown/wiki/Third-Party-Extensions)
+is maintained on the wiki for your convenience. The Python-Markdown team 
+offers no official support for these extensions. Please see the developer of 
+each extension for support.
+
+If you would like to write your own extensions, see the 
+[Extensions API](api.html) for details.