Create how-to-install-and-update.md

Author: Sarah Guthals

docs/using/how-to-install-and-update.md

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+# Installation and Updating Guide
+[Installing from a Downloaded Package File](#Installing-from-a-Package-File)  
+[Installing from the Unity Asset Store](#Installing-from-the-Asset-Store)  
+[Updating a Previously Installed Version](#Updating-the-GitHub-for-Unity-Package)
+
+
+# Installing from a Package File
+You can download the latest release from the repository at [https://github.com/github-for-unity/Unity/releases](https://github.com/github-for-unity/Unity/releases) or from the website at [https://unity.github.com/](https://unity.github.com/).
+
+Once you've downloaded the package file, you can quickly install it within Unity.
+1. Open a new Unity Project
+<img width="1001" alt="screen shot 2018-05-18 at 7 10 07 am" src="https://user-images.githubusercontent.com/1314285/40239502-1d391f4e-5a6b-11e8-8879-7342611d2759.png">
+2. Go to `Assets -> Import Package -> Custom Package`
+<img width="566" alt="screen shot 2018-05-18 at 7 11 35 am" src="https://user-images.githubusercontent.com/1314285/40239569-4131a934-5a6b-11e8-9942-2be0fcc9ded3.png">
+3. Find and open the GitHub for Unity Asset Package
+<img width="567" alt="screen shot 2018-05-18 at 7 12 33 am" src="https://user-images.githubusercontent.com/1314285/40239617-6376fc24-5a6b-11e8-9116-29eb9a450f6f.png">
+4. Click `Import` when the dialog pops up
+<img width="350" alt="screen shot 2018-05-18 at 7 12 42 am" src="https://user-images.githubusercontent.com/1314285/40239636-7101e75a-5a6b-11e8-9162-9ac9a8d8c7c1.png">
+5. After the package finishes importing, go to `Window -> GitHub` to open the GitHub window
+<img width="317" alt="screen shot 2018-05-18 at 7 13 03 am" src="https://user-images.githubusercontent.com/1314285/40239656-83597d5a-5a6b-11e8-8cba-3d3a79c90974.png">
+6. You should see the GitHub window in your Unity project, with a button to initialize your repository
+<img width="1069" alt="screen shot 2018-05-18 at 7 13 34 am" src="https://user-images.githubusercontent.com/1314285/40239682-9344314c-5a6b-11e8-961f-2293434aa1ea.png">
+
+# Installing from the Asset Store
+1. Open a new Unity Project
+<img width="1001" alt="screen shot 2018-05-18 at 7 10 07 am" src="https://user-images.githubusercontent.com/1314285/40239502-1d391f4e-5a6b-11e8-8879-7342611d2759.png">
+2. Go to `Window -> Asset Store`
+<img width="1115" alt="screen shot 2018-05-18 at 7 20 19 am" src="https://user-images.githubusercontent.com/1314285/40239800-f1a3cd6a-5a6b-11e8-9b81-54f2b947b3b9.png">
+3. Search for "GitHub" in the search bar
+<img width="246" alt="screen shot 2018-05-18 at 7 20 51 am" src="https://user-images.githubusercontent.com/1314285/40240012-6cedab6c-5a6c-11e8-844e-47bf8b836edb.png">
+4. Click on the GitHub for Unity Package
+<img width="194" alt="screen shot 2018-05-18 at 7 22 15 am" src="https://user-images.githubusercontent.com/1314285/40240031-78d16036-5a6c-11e8-9052-d5e439858068.png">
+5. Click `Download` then `Install`
+<img width="156" alt="screen shot 2018-05-18 at 7 21 37 am" src="https://user-images.githubusercontent.com/1314285/40240039-7f7bc318-5a6c-11e8-8596-f7f6d7e8e48a.png">
+<img width="152" alt="screen shot 2018-05-18 at 7 21 44 am" src="https://user-images.githubusercontent.com/1314285/40240048-84c391de-5a6c-11e8-82bb-f4ee27871ab4.png">
+6. Click `Import` when the dialog pops up
+<img width="350" alt="screen shot 2018-05-18 at 7 12 42 am" src="https://user-images.githubusercontent.com/1314285/40239636-7101e75a-5a6b-11e8-9162-9ac9a8d8c7c1.png">
+7. After the package finishes importing, go to `Window -> GitHub` to open the GitHub window
+<img width="317" alt="screen shot 2018-05-18 at 7 13 03 am" src="https://user-images.githubusercontent.com/1314285/40239656-83597d5a-5a6b-11e8-8cba-3d3a79c90974.png">
+8. You should see the GitHub window in your Unity project, with a button to initialize your repository
+<img width="1069" alt="screen shot 2018-05-18 at 7 13 34 am" src="https://user-images.githubusercontent.com/1314285/40239682-9344314c-5a6b-11e8-961f-2293434aa1ea.png">
+
+# Updating the GitHub for Unity Package
+_COMING SOON_