chore: add license

Author: lhjt

LICENSE

@@ -0,0 +1,44 @@
+Learning Platform
+
+Copyright (C) 2023 CSESoc UNSW 
+
+This program is free software: you can redistribute it and/or modify it under 
+the terms of the GNU Affero General Public License as published by the Free 
+Software Foundation at version 3 of the License.
+
+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 Affero General Public License for more details. 
+
+You should have received a copy of the GNU Affero General Public License along 
+with this program.  If not, see <http://www.gnu.org/licenses/>. 
+
+# AGPL-v3 License Extension 
+
+1. You may use, copy, modify, and distribute this software under the terms of 
+the AGPL-v3 license, provided that you include this license extension in all 
+copies or substantial portions of the software. 
+
+2. You may not use this software for commercial purposes, including but not 
+limited to selling, renting, or licensing the software or any derivative works 
+thereof. 
+
+3. If you distribute this software, you must make the source code available 
+under the AGPL-v3 license and this license extension, and must include a copy 
+of this license extension with any binary distribution. 
+
+4. If you modify this software, you must indicate in the source code that 
+changes have been made and provide the modified source code under the terms of 
+the AGPL-v3 license and this license extension. 
+
+5. This license extension applies to the entire software, including any third-
+party components included in the software. 
+
+6. If you use this software in a product that is freely available to the
+public, you must give full credit to the original authors of the software by
+prominently displaying the following attribution in the product: "This product
+includes software developed by CSESoc UNSW."
+
+7. This license extension shall not be interpreted to affect the validity or 
+enforceability of the AGPL-v3 license. 
+