Added documentation for Error

src/models/error.rs

@@ -0,0 +1,18 @@
+use std::borrow::Cow;
+use std::fmt;
+use std::fmt::{Display, Formatter};
+
+/// Custom Error list for the library.
+pub enum Error {
+    DiscordNotFound,
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        let msg = match self {
+            Error::DiscordNotFound => Cow::Borrowed("Could not connect to client. Is Discord running ?"),
+        };
+
+        f.write_str(&msg)
+    }
+}