Add proc macro to implement models

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

heromodels/examples/simple_model_example.rs

@@ -0,0 +1,29 @@
+use heromodels::model;
+use heromodels::models::core::model::{BaseModelData, Model, IndexKey};
+use serde::{Serialize, Deserialize};
+
+// Basic usage
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[model]
+pub struct SimpleUser {
+    pub base_data: BaseModelData,
+    pub login: String,
+    pub full_name: String,
+}
+
+fn main() {
+    println!("Hero Models - Simple Model Example");
+    println!("==================================");
+    
+    // Example usage of the generated implementation
+    println!("SimpleUser DB Prefix: {}", SimpleUser::db_prefix());
+    
+    let user = SimpleUser {
+        base_data: BaseModelData::new(1),
+        login: "johndoe".to_string(),
+        full_name: "John Doe".to_string(),
+    };
+    
+    println!("\nSimpleUser ID: {}", user.get_id());
+    println!("SimpleUser DB Keys: {:?}", user.db_keys());
+}