v1 implemented

it compiles

src/config.rs

@@ -0,0 +1,16 @@
+use clap::Parser;
+use std::time::Duration;
+
+#[derive(Debug, Clone, Parser)]
+#[command(name = "sloptop", about = "A lightweight TUI resource monitor")]
+pub struct Config {
+    /// Polling interval in milliseconds
+    #[arg(short, long, default_value_t = 1000, value_parser = clap::value_parser!(u64).range(200..=5000))]
+    pub interval_ms: u64,
+}
+
+impl Config {
+    pub fn refresh_interval(&self) -> Duration {
+        Duration::from_millis(self.interval_ms)
+    }
+}