fix(rs): add derives to builder pattern (#50)

* fix(rs): add derives to builder pattern

* fix: add autogenerated message

crates/rs/src/lib.rs

@@ -32,7 +32,11 @@ impl ContractBindings {
     ///
     /// * `file` - The path to the file to write the bindings to.
     pub fn write_to_file(&self, file: &str) -> io::Result<()> {
-        fs::write(file, self.to_string())
+        let content = format!(
+            "// ****\n// Auto-generated by cainome do not edit.\n// ****\n\n{}",
+            self
+        );
+        fs::write(file, content)
     }
 }
 
@@ -109,6 +113,16 @@ impl Abigen {
         self
     }
 
+    /// Sets the derives to be added to the generated types.
+    ///
+    /// # Arguments
+    ///
+    /// * `derives` - Derives to be added to the generated types.
+    pub fn with_derives(mut self, derives: Vec<String>) -> Self {
+        self.derives = derives;
+        self
+    }
+
     /// Generates the contract bindings.
     pub fn generate(&self) -> Result<ContractBindings> {
         let file_content = std::fs::read_to_string(&self.abi_source)?;