Merge branch 'flag-handling' into 'master'

Flag handling

See merge request mhart/DancingDroids!16

Cargo.toml

@@ -7,3 +7,4 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+clap = "2.33.3"

src/main.rs

@@ -1,3 +1,4 @@
+use clap::{App, Arg};
 use std::fs;
 use std::io;
 
@@ -111,6 +112,18 @@ fn open_file(filename: &str) -> io::Result<String> {
 }
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let matches = App::new("DancingDroids")
+        .version("0.1.0")
+        .about("When droids dance togethers")
+        .arg(
+            Arg::with_name("file")
+                .short("f")
+                .long("file")
+                .takes_value(true)
+                .help("Configuration file"),
+        )
+        .get_matches();
+
     let mut robot_pool: Vec<Robot> = Vec::new();
     let raw_conf = open_file("two_robots.txt")?;
     Ok(())