Update Readme.md

Signed-off-by: FarParticul <[email protected]>

themes/Gruvbox/Readme.md

@@ -3,3 +3,29 @@ SPDX-FileCopyrightText: 2024 FarParticul
 
 SPDX-License-Identifier: GPL-3.0
 -->
+Gruvbox
+---
+[Gruvbox](https://github.com/morhetz/gruvbox) style theme for fans of this palette
+
+## Preview
+![Grvbx Preview](preview.png)
+
+## License
+```
+    Gruvbox theme for PrismLauncher
+    Copyright (C) 2024 FarParticul
+
+    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/>.
+
+```