add constructor for error

src/error.rs

@@ -12,6 +12,13 @@ pub struct Error {
 }
 
 impl Error {
+    pub fn new<E: std::error::Error + 'static>(message: String, source: E) -> Self {
+        Self {
+            message,
+            source: Some(Box::new(source)),
+        }
+    }
+
     fn wrap<E: std::error::Error + 'static>(value: E) -> Option<Box<dyn std::error::Error>> {
         Some(Box::new(value))
     }