🏗️ Added 3 new asset categories: rudniki (mining), vozila (vehicles), hisne_zivali (farm animals)

assets/slike/rudniki/README.md

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+# 🪨 RUDNIKI (Mining Resources)
+
+Mining resources, ores, gems, and minerals.
+
+## Categories
+
+### **Ores**:
+- Copper ore
+- Iron ore
+- Gold ore
+- Silver ore
+- Coal
+
+### **Gems**:
+- Diamond
+- Ruby
+- Emerald
+- Sapphire
+- Amethyst
+
+### **Special Minerals**:
+- Crystal
+- Obsidian
+- Uranium
+- Titanium
+
+### **Processed**:
+- Ingots (copper, iron, gold, etc.)
+- Refined gems
+- Alloys
+
+---
+
+**Asset type**: Items  
+**Usage**: Mining gameplay, crafting materials  
+**Format**: PNG (32x32 items, 64x64 ore deposits)