added LICENSE and ReadMe

Author: scriptingosx

DownloadFullInstaller-1.0-screenshot.png

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+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this source code except in compliance with the License.
+You may obtain a copy of the License at
+
+   https://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

LICENSE.md

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+# Download Full Installer
+
+![](https://img.shields.io/github/v/release/scriptingosx/DownloadFullInstaller) ![](https://img.shields.io/github/downloads/scriptingosx/DownloadFullInstaller/latest/total) ![](https://img.shields.io/badge/macOS-11.0%2B-success) ![](https://img.shields.io/github/license/scriptingosx/DownloadFullInstaller)
+
+![](DownloadFullInstaller-1.0-screenshot.png)
+
+This is a Swift UI implementation of my [fetch-installer-pkg](https://github.com/scriptingosx/fetch-installer-pkg) script. It will list the full macOS Big Sur (and later) installer pkgs available for download in Apple's software update catalogs.
+
+You can then choose to download one of them.
+
+### Motivation
+
+You may want to download the installer pkg instead of the installer application directly, because you want to re-deploy the installer application with a management system, such as Jamf. 
+
+Since the Big Sur macOS installer application contains a single file larger than 8GB, normal packaging tools will fail. I have described the problem and some solutions in detail in [this blog post](https://scriptingosx.com/2020/11/deploying-the-big-sur-installer-application/).
+
+### Extras
+
+- Copy the download URL for a given installer pkg from the context menu.
+
+- Change the seed program in the Preferences window.
+
+### Questions
+
+#### Is this different than the fetch-installer-pkg script?
+
+Not really, other than it is a UI app and written in Swift and SwiftUI instead of a command line script written in python. I used this as a project to learn more about SwiftUI.
+
+#### Can this download older versions of the macOS installer application?
+
+No. Apple only provides installer pkgs for Big Sur and later. Earlier versions of the Big Sur installer are removed regularly.
+
+#### Will you update this so it can download older versions?
+
+No.
+
+#### How is this different than `softwareupdate` or `installinstallmacOS.py`
+
+As far as I can tell, this downloads the same pkg as `softwareupdate --fetch-full-installer` and `installinstallmacOS.py`.
+
+The difference is that the other tools then immediately perform the installation so that you get the installer application in the `/Applications` folder. This tool just downloads the pkg, so you can use it in your management system, archive the installer pkg, or manually run the installation.
+
+### Credit
+
+Both [fetch-installer-pkg](https://github.com/scriptingosx/fetch-installer-pkg) and this application are based on [Greg Neagle's installinstallmacos.py](https://github.com/munki/macadmin-scripts/blob/main/installinstallmacos.py) script.