edit CONTRIBUTING.md

Author: guillermooo

CONTRIBUTING.md

@@ -1,6 +1,5 @@
 ## Contributing
 
-
 Thanks for taking an insterest in contributing to the PowerShell package for
 Sublime Text 3!
 
@@ -11,6 +10,32 @@ Development happens on the **dev** branch. Please send your PRs against that
 branch only.
 
 
+### Building Development Versions
+
+To build development versions, first you need a configuration file in
+`$env:USERPROFILE\sublime-package-dev.json`.
+
+This file must contain the following information:
+
+    {
+        "pathToSublimeText": "...\sublime_text.exe",
+        "pathToSublimeTextData": "...\
+    }
+
+
+#### Using Sublime Text
+
+1. Press <kbd>Ctrl+Shift+B</kbd> to open the build systems menu.
+2. Select 'PowerShell: Build Dev Version'
+
+
+#### Using the Command Line
+
+From the project's root:
+
+    .\bin\BuildFolder.ps1 -verbose
+
+
 #### Running Tests
 
 If you are adding functionality or making substantial changes to existing
@@ -20,12 +45,3 @@ Currently, we have very few tests and they aren't easy to run... :-(
 
 If you feel lazy about writing tests, this is the right time to contribute --
 we'll turn a blind eye more often now than later on! ;-)
-
-
-### Building Versions
-
-The easiest way to 'build' a version now consists in copying the project's
-root folder's content to your *Data/Packages/PowerShell* directory.
-
-We have build scripts under *.\bin*, but they aren't realiable. We hope to fix 
-that soon.