Add CLI parsing

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

src/main.rs

@@ -1,3 +1,47 @@
-fn main() {
-    println!("Hello, world!");
+use clap::Parser;
+use std::net::{IpAddr, SocketAddr};
+
+#[derive(Debug, Clone, Parser)]
+#[command(
+    name = "herocoordinator",
+    version,
+    about = "Hero Coordinator CLI",
+    long_about = None
+)]
+struct Cli {
+    #[arg(
+        long = "mycelium-ip",
+        short = 'i',
+        env = "MYCELIUM_IP",
+        default_value = "127.0.0.1",
+        help = "IP address where Mycelium JSON-RPC is listening (default: 127.0.0.1)"
+    )]
+    mycelium_ip: IpAddr,
+
+    #[arg(
+        long = "mycelium-port",
+        short = 'p',
+        env = "MYCELIUM_PORT",
+        default_value_t = 9651u16,
+        help = "Port for Mycelium JSON-RPC (default: 9651)"
+    )]
+    mycelium_port: u16,
+
+    #[arg(
+        long = "redis-addr",
+        short = 'r',
+        env = "REDIS_ADDR",
+        default_value = "127.0.0.1:6379",
+        help = "Socket address of Redis instance (default: 127.0.0.1:6379)"
+    )]
+    redis_addr: SocketAddr,
+}
+
+fn main() {
+    let cli = Cli::parse();
+
+    println!(
+        "mycelium_ip={}, mycelium_port={}, redis_addr={}",
+        cli.mycelium_ip, cli.mycelium_port, cli.redis_addr
+    );
 }