Added the main mod class, client and common proxies registering custom model entity

src/main/java/com/goodbird/cnpcgeckoaddon/CNPCGeckoAddon.java

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+package com.goodbird.cnpcgeckoaddon;
+
+import cpw.mods.fml.common.Mod;
+import cpw.mods.fml.common.SidedProxy;
+import cpw.mods.fml.common.event.FMLPreInitializationEvent;
+
+@Mod(modid = "cnpcgeckoaddon",
+    name = "CustomNPC Gecko Addon",
+    version = "1.0",
+    dependencies = "required-after:customnpcs;required-after:geckolib3")
+public class CNPCGeckoAddon {
+
+    @SidedProxy(clientSide = "com.goodbird.cnpcgeckoaddon.client.ClientProxy", serverSide = "com.goodbird.cnpcgeckoaddon.CommonProxy")
+    public static CommonProxy proxy;
+
+    @Mod.Instance
+    public static CNPCGeckoAddon instance;
+
+    @Mod.EventHandler
+    public void preInit(FMLPreInitializationEvent ev) {
+        proxy.preInit(ev);
+    }
+}

src/main/java/com/goodbird/cnpcgeckoaddon/CommonProxy.java

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+package com.goodbird.cnpcgeckoaddon;
+
+import com.goodbird.cnpcgeckoaddon.entity.EntityCustomModel;
+import cpw.mods.fml.common.event.FMLPreInitializationEvent;
+import cpw.mods.fml.common.registry.EntityRegistry;
+
+public class CommonProxy {
+
+    public void preInit(FMLPreInitializationEvent ev){
+        EntityRegistry.registerModEntity(EntityCustomModel.class, "CustomModelEntity", 0, CNPCGeckoAddon.instance, 64, 10, false);
+    }
+}

src/main/java/com/goodbird/cnpcgeckoaddon/client/ClientProxy.java

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+package com.goodbird.cnpcgeckoaddon.client;
+
+import com.goodbird.cnpcgeckoaddon.CommonProxy;
+import com.goodbird.cnpcgeckoaddon.client.renderer.RenderCustomModel;
+import com.goodbird.cnpcgeckoaddon.entity.EntityCustomModel;
+import cpw.mods.fml.client.registry.RenderingRegistry;
+import cpw.mods.fml.common.event.FMLPreInitializationEvent;
+
+
+public class ClientProxy extends CommonProxy {
+
+    @Override
+    public void preInit(FMLPreInitializationEvent ev) {
+        super.preInit(ev);
+        RenderingRegistry.registerEntityRenderingHandler(EntityCustomModel.class, new RenderCustomModel());
+    }
+
+}