Slack dark theme install guide

Windows 10 Dark Theme/Slack/install.md

@@ -0,0 +1,34 @@
+# Slack Dark Theme
+
+As many of you who follow what I do will know, I like things dark. I don't like the white glare of a computer screen.
+
+I am sure at least some of you use [Slack](http://www.slack.com) for your work communications? If not I strongly recommend you check it out.
+
+The only down-side is it doesn't yet have a dark theme. So looking around the internet I found plenty of ways to do it by just editing the [Electron](https://electron.atom.io/) app javascript files and injecting a custom css sheet.
+
+So, in order to do this now before Slack officially supports it, do the following:
+
+ - Press <kbd>Ctrl + R</kbd> to open `Run...` in Windows
+ - Type `%LOCALAPPDATA%` and press <kbd>Enter</kbd> to open your current users `AppData` folder, such as `C:\Users\luke\AppData\Local`
+ - Go into `slack\app-2.x.x\resources\app.asar.unpacked\src\static` and open the **ssb-interop.js** file
+ - Add the following to the end of the **ssb-interop.js** file
+
+```
+document.addEventListener('DOMContentLoaded', function() {
+  $.ajax({
+    
+    url: 'https://raw.githubusercontent.com/angelsix/youtube/develop/Windows%2010%20Dark%20Theme/Slack/slack-dark.css',
+    success: function(css) {
+      $("<style></style>").appendTo('head').html(css);
+    }
+  }); 
+ });
+```
+
+ - Now close Slack (including in the Taskbar)
+
+ ![taskbar-image](images/posts/2017-09-12-slack-dark-theme/close-slack.png "Slack Taskbar")
+
+ - Restart Slack to see the lovely new dark theme :smiley:
+
+ ![slack-dark](images/posts/2017-09-12-slack-dark-theme/dark-slack.png "Slack Dark")