chore: added license to package.json

Signed-off-by: Jonathan <theflametrooper@gmail.com>

backend/package.json

@@ -4,6 +4,7 @@
   "description": "A modern, open-source, collaborative music app https://musare.com",
   "main": "app.js",
   "author": "Musare Team",
+  "license": "GPL-3.0",
   "repository": "https://github.com/Musare/MusareNode",
   "scripts": {
     "docker:dev": "nodemon -L /opt/app",

frontend/package.json

@@ -4,6 +4,7 @@
 	"description": "A modern, open-source, collaborative music app https://musare.com",
 	"main": "main.js",
 	"author": "Musare Team",
+	"license": "GPL-3.0",
 	"repository": "https://github.com/Musare/MusareNode",
 	"scripts": {
 		"lint": "npx eslint . --ext .js,.vue",