Improved CLI (#244)

* Added in version flag and name flag

* Improved CLI

Author: Yash-Singh1

cli.js

@@ -2,8 +2,46 @@
 
 'use strict';
 
+process.title = 'mime';
 var mime = require('.');
-var file = process.argv[2];
+var pkg = require('./package.json');
+var args = process.argv.splice(2);
+
+if (args.includes('--version') || args.includes('-v') || args.includes('--v')) {
+  console.log(pkg.version);
+  process.exit(0);
+}
+else if (args.includes('--name') || args.includes('-n') || args.includes('--n')) {
+  console.log(pkg.name);
+  process.exit(0);
+}
+else if (args.includes('--help') || args.includes('-h') || args.includes('--h')) {
+  console.log(pkg.name + ' - ' + pkg.description + '\n');
+  console.log(`Usage:
+
+  mime [flags] [path_or_extension]
+
+  Flags:
+    --help, -h                     Show this message
+    --version, -v                  Display the version
+    --name, -n                     Print the name of the program
+
+  Note: the command will exit after it executes if a command is specified
+  The path_or_extension is the path to the file or the extension of the file.
+
+  Examples:
+    mime --help
+    mime --version
+    mime --name
+    mime -v
+    mime src/log.js
+    mime new.py
+    mime foo.sh
+  `);
+  process.exit(0);
+}
+
+var file = args[0];
 var type = mime.getType(file);
 
 process.stdout.write(type + '\n');