Add CLI support

Add cli.js

.gitignore

@@ -120,3 +120,4 @@ quick-test/*
 *~
 *.swo
 *.swp
+bin

cli.js

@@ -0,0 +1,79 @@
+import chalk from 'chalk';
+import arg from 'arg';
+
+import guessFormat from './index.js';
+import pkg from './package';
+
+const warning = (message) => chalk`{yellow WARNING:} ${message}`;
+const info = (message) => chalk`{magenta INFO:} ${message}`;
+const error = (message) => chalk`{red ERROR:} ${message}`;
+
+const showHelp = () => console.log(
+	chalk`
+	{bold.cyan moment-guess} - {blue Utility for guessing date's format}
+
+	{bold USAGE}
+
+	{bold $} {cyan moment-guess} --date {yellow 2020-10-10}
+	{bold $} {cyan moment-guess} --version
+	{bold $} {cyan moment-guess} --help
+
+	{bold OPTIONS}
+
+	-h, --help                          Shows this help message
+
+	-v, --version                       Displays the current version of moment-guess
+
+	-d, --date                          Displays the provided date's format
+	`
+);
+const showUsage = () => console.log(
+	chalk`
+	{bold USAGE}
+
+	{bold $} {cyan moment-guess} --date {yellow 2020-10-10}
+	{bold $} {cyan moment-guess} --version
+	{bold $} {cyan moment-guess} --help
+	`
+);
+
+const showVersion = () => console.log(chalk.bold.white(pkg.version));
+
+(function() {
+	let args = null;
+	let config = {};
+	let date;
+
+	try {
+		args = arg({
+			'--help': Boolean,
+			'--version': Boolean,
+			'--date': String,
+			'--preference': String,
+			'-h': '--help',
+			'-v': '--version',
+			'-d': '--date',
+			'-p': '--preference',
+		});
+	} catch (err) {
+		console.error(error(err.message));
+		process.exit(1);
+	}
+
+	if (args['--help']) {
+		return showHelp()
+	}
+	if (args['--version']) {
+		return showVersion();
+	}
+	if (args['--date']) {
+		date = args['--date'];
+	}
+
+	if (!date) {
+		console.log(chalk`{bold.red Error:} {red Missing date!}`);
+		return showUsage();
+	}
+	console.log(chalk.bold.white(guessFormat(date, config)));
+})();
+