chore: Change license to GPL v3

LICENSE.md

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+# License
+Copyright (C) Vendure GmbH
+
+This software is available under two different licenses:
+* GNU General Public License version 3 (GPLv3) as Vendure Community Edition
+* Vendure Commercial License (VCL)
+
+The default Vendure license, without a valid Vendure Commercial License agreement, is the Open-Source GPLv3 license.
+
+## GNU General Public License version 3 (GPLv3)
+
+If you decide to choose the GPLv3 license, you must comply with the following terms:
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+## Vendure Commercial License (VCL)
+
+Alternatively, commercial and supported versions of the program - also known as
+Commercial Distributions - must be used in accordance with the terms and conditions
+contained in a separate written agreement between you and Vendure GmbH.
+For more information about the Vendure Commercial License (VCL) please contact [email protected].
+
+Please see also (files in this directory):
+[Licensing FAQ - license-faq.md](license/license-faq.md)
+[GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 - gpl-3.0.txt](license/gpl-3.0.txt)

README.md

@@ -175,4 +175,4 @@ The reason we do not rely on Lerna to push the release to Git is that this repo
 
 ## License
 
-MIT
+See [LICENSE.md](./LICENSE.md)

license/license-faq.md

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+# Vendure - Licensing FAQ
+
+## What is the license for Vendure?
+
+Vendure and all contributed files in this Git repository are available under two different licenses:
+
+* GNU General Public License version 3 (GPLv3)
+* Vendure Commercial License (VCL)
+  If you don't have a separate written licensing agreement between you and Vendure GmbH then always GPLv3 applies to you.
+
+The following FAQ covers only GPLv3.
+
+# GPLv3 FAQ
+
+## What does "licensed under the GPLv3" actually mean?
+That means you are free to download, reuse, modify, and distribute
+any files hosted in the Vendure Git repository under the terms of the GPL version 3, and to run Vendure in
+combination with any code with any license that is compatible with GPL version 3, such as the
+Affero General Public License (AGPL) version 3.
+
+## Does the license cover just TypeScript, or everything?
+We require that all files in this repository (TypeScript, CSS, HTML) that are not part of a bundled 3rd party library are under the terms of the GPLv3.
+
+## Copyright & contributions
+All Vendure contributors retain copyright on their code, but agree to release it under the same licenses as Vendure.
+If you are unable or unwilling to contribute a patch under the GPL version 3 and the Vendure Commercial License, do not submit a patch.
+
+## I want to release my work under a different license than GPLv3, is that possible?
+No. You can only release your work under any GPL version 3 or later compatible license.
+
+## The GPL requires that I distribute the "source code" of my files. What does that mean for a web application?
+The "source code" of a file means the format that is intended for people to edit.
+
+For TypeScript, CSS, and HTML code, the file itself, without any compression or obfuscation, is its own source code.
+The "source code" is whichever version is intended to be edited by people.
+
+## If I write a plugin for my Vendure application, do I have to license it under the GPL?
+Yes. Vendure plugins for your application are a derivative work of Vendure.
+If you distribute them, you must do so under the terms of the GPL version 3 or later.
+
+You are not required to distribute them at all, however.
+
+However, when distributing your own Vendure-based work, it is important to keep in mind what the GPLv3 applies to.
+The GPLv3 on code applies to code that interacts with that code, but not to data.
+That is, Vendure's TypeScript code is under the GPLv3, and so all TypeScript code that interacts with it must also be
+under the GPLv3 or GPLv3 compatible. Images and JSON files that TypeScript sends to the browser are not
+affected by the GPL because they are data
+
+When distributing your own plugin, therefore,
+the GPLv3 applies to any pieces that directly interact with parts of Vendure that are under the GPLv3.
+Images and other asset files you create yourself are not affected.
+
+## If I write a plugin for my application, do I have to give it away to everyone?
+No. The GPL requires that if you make a derivative work of Vendure and distribute it to someone else,
+you must provide that person with the source code under the terms of the GPLv3 so that they may modify and redistribute
+it under the terms of the GPLv3 as well. However, you are under no obligation to distribute the code to anyone else.
+If you do not distribute the code but use it only within your organization,
+then you are not required to distribute it to anyone at all.
+
+However, if your plugin is of general use then it is often a good idea to contribute it back to the community anyway.
+You can get feedback, bug reports, and new feature patches from others who find it useful.
+
+## Is it permitted for me to sell Vendure or a Vendure plugin?
+Yes. However, you must distribute it under the GPL version 3 or later,
+so those you sell it to must be allowed to modify and redistribute it as well. See questions above.
+
+## Do I have to give the code for my web site to anyone who visits it?
+
+No. The GPL does not consider viewing a web site to count as "distributing",
+so you are not required to share the code running on your server.
+
+## I have a question not answered here. What should I do?
+**If you have a question about your specific case, please consult with a copyright attorney in your area.**
+**We cannot and will not offer legal advice.**
+
+If you have a general question about Vendure licensing or other legal issues,
+please post your question in the [Vendure discord community](https://vendure.io/community).
+
+### Credits / License of this FAQ page
+This FAQ is based on https://www.drupal.org/licensing/faq (modified)- many thanks to the Drupal Association!
+License: Creative Commons Attribution-ShareAlike license 2.0 (http://creativecommons.org/licenses/by-sa/2.0/)