adding a line #!usr/bin/env node to executable files

Author: KateChe31

bin/brain-games.js

@@ -1,3 +1,4 @@
+#!/usr/bin/env node
 import greetings from "../src/cli.js";
 
 greetings();

bin/brain-gcd.js

@@ -1,3 +1,4 @@
+#!/usr/bin/env node
 import playGameGCD from '../src/games/brain-gcd.js';
 
 playGameGCD();

bin/brain-prime.js

@@ -1,3 +1,4 @@
+#!/usr/bin/env node
 import playGamePrime from '../src/games/brain-prime.js';
 
 playGamePrime();

bin/brain-progression.js

@@ -1,3 +1,4 @@
+#!/usr/bin/env node
 import playGameProgression from '../src/games/brain-progression.js';
 
 playGameProgression();