Create errors module with basic error

src/errors.rs

@@ -0,0 +1,14 @@
+//! Common Yorokobot errors
+
+use mongodb::error::Error as MongoError;
+use serenity::prelude::SerenityError;
+
+/// The kind of errors that can be returned by Client::new
+#[derive(Debug)]
+pub enum ClientsError {
+    /// Serenity error while building client
+    Discord(SerenityError),
+
+    ///Mongo error while parsing options
+    Database(MongoError),
+}