feat: with doctor

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/cuddle-please/src/command.rs

@@ -221,6 +221,20 @@ impl Command {
                     }
                 }
             }
+            Some(Commands::Doctor {}) => {
+                match std::process::Command::new("git").arg("-v").output() {
+                    Ok(o) => {
+                        let stdout = std::str::from_utf8(&o.stdout).unwrap_or("".into());
+                        self.ui.write_str_ln(&format!("OK: {}", stdout));
+                    }
+                    Err(e) => {
+                        self.ui.write_str_ln(&format!(
+                            "WARNING: git is not installed: {}",
+                            e.to_string()
+                        ));
+                    }
+                }
+            }
             None => {
                 tracing::debug!("running bare command");
                 // 2. Parse the cuddle.please.yaml let cuddle.please.yaml take precedence
@@ -277,6 +291,8 @@ enum Commands {
         #[command(subcommand)]
         command: GiteaCommand,
     },
+    /// Helps you identify missing things from your execution environment for cuddle-please to function as intended
+    Doctor {},
 }
 
 #[derive(Subcommand, Debug, Clone)]