Add missing header

Author: lowercasebtw

src/main/java/btw/mixces/animatium/mixins/accessor/RenderPipelinesAccessor.java

@@ -1,3 +1,26 @@
+/**
+ * Animatium
+ * The all-you-could-want legacy animations mod for modern minecraft versions.
+ * Brings back animations from the 1.7/1.8 era and more.
+ * <p>
+ * Copyright (C) 2024-2025 lowercasebtw
+ * Copyright (C) 2024-2025 mixces
+ * Copyright (C) 2024-2025 Contributors to the project retain their copyright
+ * <p>
+ * 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.
+ * <p>
+ * 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.
+ * <p>
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
 package btw.mixces.animatium.mixins.accessor;
 
 import com.mojang.blaze3d.pipeline.RenderPipeline;