Add sqlite command line tool install instructions data-lessons#23 dat…

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index.md

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 This Library Carpentry lesson introduces librarians to relational database management system using SQLite. At the conclusion of the lesson you will: understand what SQLite does; use SQLite to summarise and link databases.
 
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 > ## Prerequisites
 >
 > You will need to install [Firefox](https://www.mozilla.org/en-US/firefox/products/) and [SQLite](https://www.sqlite.org/) to complete this lesson.
 {: .prereq}
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+> #### Linux and Mac OS x
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+> SQLite command line tools come preinstalled on Linux and Mac OS x.
+
+> In order to check they are available type `sqlite3` at the terminal command line. To exit type `.exit`.
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+> #### Windows
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+>  On Windows download the [Windows Installer](https://github.com/swcarpentry/windows-installer/releases/download/v0.3/SWCarpentryInstaller.exe)
+Copy the file to a directory and open the directory using the windows command line. Type `sqlite3`.
+
+> For a more detailed explanation see this [tutorial](http://www.sqlitetutorial.net/download-install-sqlite/).