Add README

Author: JohnSundell

README.md

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+# 🎨 My Xcode theme - Sundell's Colors
+
+This repository contains the Xcode theme that I use. Feel free to use it or modify it to your liking 👍
+
+![](Preview.png)
+
+## Installing using Marathon
+
+The easiest way to install this Xcode theme is using **[Marathon](https://github.com/johnsundell/marathon):**
+
+1. Install the latest version of Marathon if you haven't already:
+```
+$ git clone https://github.com/johnsundell/marathon.git
+$ cd Marathon && make
+```
+
+2. Run the install script which will install [Adobe's Source Code Pro](https://github.com/adobe-fonts/source-code-pro) font & this Xcode theme for you:
+```
+marathon run johnsundell/xcodetheme
+```
+
+## Installing manually
+
+You can also choose to do things manually if you want:
+
+1. Clone this repo:
+```
+$ git clone https://github.com/johnsundell/xcodetheme.git
+```
+
+2. Create a folder at this path if it doesn't exist already:
+```
+~/Library/Developer/Xcode/UserData/FontAndColorThemes
+```
+
+3. Copy the file `SundellsColors.xccolortheme` into the above folder.
+
+4. Download the latest release of Source Code Pro from [its repo](https://github.com/adobe-fonts/source-code-pro).
+
+5. Unzip the font archive and move the files in the `TTF` folder to `~/Library/Fonts`.
+
+6. Should've used the install script, right? 😉
+
+## Attributions
+
+This Xcode theme is the result of years of tweaks and modifications to some version of a "Solarized" theme. I have no idea where I got the
+original material for this theme from, but if you recognize some aspect of this theme as coming from something you made, feel free to open
+an issue and I'll gladly add attributions to you 🙂