feat: Add image builder scripts

scripts/app-stream/README.md

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+# Overview
+
+This package allows you to initialize an AppStream Image Builder
+
+
+# Development
+
+To pull in dependencies
+
+`npm install`
+
+To run the script to start an image builder
+
+`npm run start-image-builder -- <AWS Profile> <region>`

scripts/app-stream/SETUP.md

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+# Overview
+
+This following guide will show you how to set up an AppStream image with the following applications installed: Firefox, Notepad, PuttyGen, and Putty. 
+
+### High Level Overview
+1. We launch an AppStream Image Builder instance.
+2. We log into the AppStream Image builder instance and run a script to build an image with Firefox, PuttyGen, Putty, and Notepad.
+
+
+### Launching an AppStream Image Builder instance
+1. Navigate to `scripts/app-stream` directory
+2. Run the following commands
+```
+npm install
+npm run start-image-builder -- <AWS Profile> <region>
+```
+Note: Please set up your [AWS Profile](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-profiles.html) beforehand so that you have permission to launch an AppStream image builder instance in your AWS Account.
+3. Once the Image Builder is launched and ready, click on the URL provided in the terminal console. This will take you to the AppStream page on the AWS Console.
+
+### Building AppStream Image
+![Image Builder Screenshot](./screenshots/ImageBuilderSelector.png)
+1. On the AppStream page in AWS console, select the AppStream image that was built in the previous step and click Connect. 
+2. This will open a new tab in your browser. When the prompt ask for which user you would like to log in as, choose Administrator. This will take you to a Windows Desktop that you can interact with to create your AppStream image. 
+3. On the Windows desktop, click the `Start` button and type in `Windows Powershell`. Right click the application in the search result, and choose `Run as administrator`
+4. Run the following commands
+```
+# Pull the Image Builder script from Github
+Invoke-WebRequest -Uri https://raw.githubusercontent.com/awslabs/service-workbench-on-aws/image-builder-scripts/scripts/app-stream/buildImage.ps1 -OutFile buildImage.ps1
+
+# Execute Image builder script
+.\buildImage.ps1
+```
+5. At this point the Image builder will build your image and you'll see a "Failed to reserve a session" modal. This is expected. Log back into AppStream on the AWS Console and wait till the AppStream image is built.

scripts/app-stream/buildImage.ps1

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+# Install Putty using Chocolatey
+Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
+
+choco install -y putty.install
+
+# Add Applications
+
+cd "C:\Program Files\Amazon\Photon\ConsoleImageBuilder"
+
+.\image-assistant.exe add-application --absolute-app-path "C:\Program Files\PuTTY\putty.exe" --display-name Putty --name Putty
+
+.\image-assistant.exe add-application --absolute-app-path "C:\Program Files\PuTTY\puttygen.exe" --display-name PuttyGen --name PuttyGen
+
+.\image-assistant.exe add-application --absolute-app-path "C:\Windows\System32\notepad.exe" --display-name Notepad --name Notepad
+
+.\image-assistant.exe add-application --absolute-app-path "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" --display-name Firefox --name Firefox
+
+# Create App
+$ImageName="FirefoxPuttyNotepad_" + $(Get-Date -Format "MM-dd-yyyy-hh-mm-ss")
+.\image-assistant.exe create-image --name $ImageName