Parse CLI arguments with clap

Cargo.toml

@@ -2,3 +2,6 @@
 name = "spaceapi2prometheus"
 version = "0.1.0"
 edition = "2021"
+
+[dependencies]
+clap = { version = "4.2.7", features = ["cargo", "derive"] }

src/main.rs

@@ -0,0 +1,17 @@
+use clap::Parser;
+
+#[derive(Parser)]
+#[command(version, about)]
+struct Cli {
+    /// SpaceAPI endpoint
+    #[arg(short, long)]
+    url: String,
+
+    /// Period of querying, in seconds
+    #[arg(short, long, default_value_t = 300)]
+    delay: u64,
+}
+
+fn main() {
+    let cli = Cli::parse();
+}