Add license headers

.eslintrc.json

@@ -2,7 +2,41 @@
     "root": true,
     "parser": "@typescript-eslint/parser",
     "ignorePatterns": ["dist"],
+    "plugins": ["header"],
     "rules": {
+        // Since it's only been a month and Vencord has already been stolen
+        // by random skids who rebranded it to "AlphaCord" and erased all license
+        // information
+        "header/header": [
+            2,
+            "block",
+            [
+                {
+                    "pattern": "!?",
+                    "template": ""
+                },
+                " * Vencord, a modification for Discord's desktop app",
+                {
+                    "pattern": " \\* Copyright \\(c\\) \\d{4}",
+                    "template": " * Copyright (c) 2022 Vendicated and contributors"
+                },
+                " *",
+                " * 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 <https://www.gnu.org/licenses/>.",
+                ""
+            ],
+            2
+        ],
         "quotes": ["error", "double", { "avoidEscape": true }],
         "jsx-quotes": ["error", "prefer-double"],
         "no-mixed-spaces-and-tabs": "error",