Added Build from source section

Author: texhex

README.md

@@ -26,7 +26,13 @@ If you are using EMET: If the "Only trusted fonts" option is activated, you need
 
 ## Contributions
 
-Any constructive contribution is very welcome! If you have any question or encounter a bug, please create a new [issue](https://github.com/source-foundry/Hack-windows-installer/issues/new). 
+Any constructive contribution is very welcome! If you have any question or encounter a bug, please create a new [issue](https://github.com/source-foundry/Hack-windows-installer/issues/new).
+
+## Build from source
+
+To build this setup yourself, download the newest ANSI (not unicode)  version of [Inno Setup](http://www.jrsoftware.org/isdl.php). Install it and activate the option to install the [Inno Setup Preprocessor](http://www.jrsoftware.org/ispphelp/). 
+
+Double-click `HackWindowsInstall.iss` (from folder `src`), which will load it in Inno Setup and then select *Build* - *Compile*.    
 
 ## About
-Copyright © 2016 [Michael Hex](http://www.texhex.info/) / Source Foundry. Licensed under the **MIT License**. For details, please see LICENSE.
+Copyright © 2016 [Michael Hex](http://www.texhex.info/) / Source Foundry. Licensed under the **MIT License**. For details, please see [LICENSE.txt](https://github.com/source-foundry/Hack-windows-installer/blob/master/LICENSE.txt).