feat: ipc server and cli

src/ipc/responses.rs

@@ -0,0 +1,17 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(tag = "type")]
+pub enum Response {
+    Ok,
+    Err { message: Option<String> },
+}
+
+impl Response {
+    /// Creates a new `Response::Error`.
+    pub fn error(message: &str) -> Self {
+        Self::Err {
+            message: Some(message.to_string()),
+        }
+    }
+}