Update readme.md from the one in prequel-pages

README.md

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-# Prequel
+---
+title: Prequel
+layout: default
+---
 
 [![Build status](https://ci.appveyor.com/api/projects/status/ebtg15yc3wls89yi/branch/master?svg=true)](https://ci.appveyor.com/project/edyoung/prequel/branch/master)
 
+# Prequel.
+
+Prequel was born out of working on a product which contains a large number of database schemas and stored procedures. 
+Every so often, a really basic error would be accidentally committed to the repository - sometimes, the SQL had syntax errors.
+This wasn't caught until tests were run, which seemed wasteful. So I wanted a tool I could run on plain .sql files 
+and integrate into the build system so that it would catch syntax errors and other errors earlier.
+
+## Basic Usage
+Say you have a file foo.sql which contains:
+
+    create procedure sp_foo as 
+	    declare @myvar as int
+	    set @mvar = 2
+    go
+
+You can run prequel like so:
+
+    PS C:\> .\Prequel.exe /warn:3 foo.sql
+
+And it will print out
+
+    Prequel version 0.1.0.0
+    Warnings:
+    c:\temp\foo.sql(1) : WARNING 4 : Procedure sp_foo should not be named with the prefix 'sp_'
+    c:\temp\foo.sql(3) : WARNING 1 : Variable @mvar used before being declared
+    c:\temp\foo.sql(1) : WARNING 3 : Procedure sp_foo does not SET NOCOUNT ON
+    c:\temp\foo.sql(2) : WARNING 2 : Variable @myvar declared but never used
+
+## Installation and prerequisites.
+
+Prequel requires the Microsoft SQL Server 2014 Transact-SQL ScriptDom package, which can be found on 
+[http://www.microsoft.com/en-us/download/details.aspx?id=42295](http://www.microsoft.com/en-us/download/details.aspx?id=42295).
+Click Downlaod and choose the SqlDom.msi installer. To install Prequel itself, just unpack the .zip somewhere on your path. 
+Note that even if you want to target an earlier version of SQL, you still want the 2014 ScriptDom package.
+
+## Status
+The tool works, but is unpolished and has a very small set of cases that it will detect so far. 
+It works only on Windows, and only supports Microsoft SQL Server's T-SQL dialect of SQL.
+
 
-A tool for linting SQL files for Microsoft SQL Server. Not functional yet.
 
-The intended use is to capture simple SQL programming errors at compile time, before the SQL is presented to a real database.