Added cli options and help command, WIP readme update

lib/utils.dart

@@ -1,5 +1,48 @@
+import 'dart:io';
+
+import 'package:args/args.dart';
+
 extension StringUtils on String {
   String capitalize() {
     return substring(0, 1).toUpperCase() + substring(1);
   }
 }
+
+({bool success, File? file}) getTomlFromArgs(List<String> args) {
+  const String templateResumePath = 'assets/resume_template.toml';
+  final parser = ArgParser();
+  parser.addOption('input', abbr: 'i', defaultsTo: 'examples/resume.toml', help: 'Input file path');
+  parser.addFlag('help', abbr: 'h', help: 'Prints help info');
+  final parsedResults = parser.parse(args);
+
+  if (parsedResults.flag("help")) {
+    stdout.writeln(parser.usage);
+    return (success: false, file: null);
+  }
+
+  final inputFilePath = parsedResults.option('input');
+  if (inputFilePath == null) {
+    throw Exception('No valid input provided.');
+  }
+  final inputFile = File(inputFilePath);
+  if (!inputFile.existsSync()) {
+    stdout.writeln(
+      'Provided `$inputFilePath`, but it does not exist. Would you like to start with the template?\n\t($templateResumePath copied to $inputFilePath)\n(y/n): ',
+    );
+    final ans = stdin.readLineSync()?.toLowerCase() ?? 'n';
+    if (ans == 'y') {
+      stdout.writeln('Copying over...');
+      File(templateResumePath).copySync(inputFilePath);
+      final newFile = File(inputFilePath);
+      if (!newFile.existsSync()) {
+        return (success: false, file: null);
+      }
+      return (success: true, file: newFile);
+    } else {
+      stdout.writeln('Got it. Try again with an actual existing document. You got this 👍');
+      return (success: false, file: null);
+    }
+  } else {
+    return (success: true, file: inputFile);
+  }
+}