Add markdown format support (#25)

Co-authored-by: Dawid Dziurla <dawidd0811@gmail.com>

node_modules/showdown/src/cli/cli.js

@@ -0,0 +1,45 @@
+/**
+ * Created by tivie
+ */
+'use strict';
+
+var yargs = require('yargs');
+
+yargs
+  .version()
+  .alias('v', 'version')
+  .option('h', {
+    alias: 'help',
+    description: 'Show help'
+  })
+  .option('q', {
+    alias: 'quiet',
+    description: 'Quiet mode. Only print errors',
+    type: 'boolean',
+    default: false
+  })
+  .option('m', {
+    alias: 'mute',
+    description: 'Mute mode. Does not print anything',
+    type: 'boolean',
+    default: false
+  })
+  .usage('Usage: showdown <command> [options]')
+  .demand(1, 'You must provide a valid command')
+  .command('makehtml', 'Converts markdown into html')
+  .example('showdown makehtml -i foo.md -o bar.html', 'Converts \'foo.md\' to \'bar.html\'')
+  .wrap(yargs.terminalWidth());
+
+var argv = yargs.argv,
+    command = argv._[0];
+
+if (command === 'makehtml') {
+  require('./makehtml.cmd.js').run();
+} else {
+  yargs.showHelp();
+}
+
+if (argv.help) {
+  yargs.showHelp();
+}
+process.exit(0);