feat: Setup the CLI and create repo view command

Signed-off-by: Awiteb <a@4rs.nl>

src/error.rs

@@ -0,0 +1,38 @@
+// n34 - A CLI to interact with NIP-34 and other stuff related to codes in nostr
+// Copyright (C) 2025 Awiteb <a@4rs.nl>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://gnu.org/licenses/gpl-3.0.html>.
+
+use std::process::ExitCode;
+
+use nostr_sdk::client::Error as ClientError;
+
+pub type N34Result<T> = Result<T, N34Error>;
+
+/// N34 errors
+#[derive(Debug, thiserror::Error)]
+pub enum N34Error {
+    #[error("Client Error: {0}")]
+    Client(#[from] ClientError),
+    #[error("Unable to locate the repository. The repository may not exists in the given relays")]
+    NotFoundRepo,
+}
+
+impl N34Error {
+    /// Returns the exit code associated with this error
+    pub fn exit_code(&self) -> ExitCode {
+        // TODO: More specific exit code
+        ExitCode::FAILURE
+    }
+}