Flesh out README file

README

@@ -1,4 +1,46 @@
 sermon 0.9
 ==========
 
-Sermon markup converter
+This utility converts text markup into various presentable forms.
+
+Usage
+-----
+
+sermon [-s STYLE] INPUT
+
+
+  -h           Display help message
+  -s STYLE     The stylesheet to use to transform the markup (default: html5)
+
+  INPUT        Name of markup file (- for stdin)
+  
+
+Markup Syntax
+-------------
+The markup syntax is very simple:
+
+  - Provide a header with title and other information at the top:
+
+    [title: My Document Title]
+    [author: My Name]
+    [date: January 1, 2015]
+    [occasion: New Year's Day]
+    [text: Luke 2:21-40]
+
+    Note that all fields are optional.
+
+  - Leave a blank line between paragraphs.
+
+  - Use *asterisks* for emphasis (rendered in italics)
+
+  - Use ^{notename} within the text for a footnote/endnote reference.
+    Provide the footnote below your text with
+    {ref:notename:Author, *Title*. etc...}
+
+  - For an offset block quotation, prepend > to each line of a paragraph:
+
+    > This paragraph will be
+    > a block quote.
+
+  - Text enclosed between [* starred braces *] will be ignored as a comment.
+