add: installation guides

01-get-started/osx-installation.md

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+# OS X INSTALLATION CHEATSHEET
+
+## 1- Install Visual Studio Code Editor
+
+1. Install it but don't open it yet.
+2. Go to: [https://code.visualstudio.com](https://code.visualstudio.com)
+3. Select OS X (Mac) and start downloading
+4. Uncompress the downloaded file and move it to your `~/Applications` directory.
+
+## 2- Install Git
+
+1. Grab and run the installer. Go to: [https://git-scm.com/downloads](https://git-scm.com/downloads)
+2. Select VSCode as the default editor
+
+## 3- Install Go
+
+1. Go to [https://golang.org/dl](https://golang.org/dl)
+2. Select OS X (Mac)
+3. Start the installer
+
+## 4- Configure VS Code
+
+1. Open VS Code; from the extensions tab at the left, search for "go" and install it
+2. Close VS Code completely and open it up again
+
+3. Go to View menu; select **Command Palette**
+    1. Or just press `cmd+shift+p`
+    2. Type: `go install`
+    3. Select _"Go: Install/Update Tools"_
+    4. Check all the checkboxes
+
+4. After it's done, open the **Command Palette** again
+    1. Type: `shell`
+    2. Select: _"Install 'code' command in PATH"_
+        1. **NOTE:** You don't have to do this if you're on Windows.
+
+## That's all! Enjoy! 🤩
+
+<div style="page-break-after: always;"></div>
+
+> For more tutorials: [https://blog.learngoprogramming.com](https://blog.learngoprogramming.com)
+> 
+> Copyright © 2018 Inanc Gumus
+> 
+> Learn Go Programming Course
+> 
+> [Click here to read the license.](https://creativecommons.org/licenses/by-nc-sa/4.0/)