Add validators schema and code templates

src/templates/node-yargs.handlebars

@@ -0,0 +1,52 @@
+#!/usr/bin/env node
+
+import yargs from 'yargs';
+import { hideBin } from 'yargs/helpers';
+
+const argv = yargs(hideBin(process.argv))
+  .command('{{spec.name}}', '{{spec.description}}', (yargs) => {
+    return yargs
+      .option('version', {
+        alias: 'v',
+        type: 'boolean',
+        description: 'Show version'
+      })
+      {{#each spec.globalOptions}}
+      .option('{{name}}', {
+        {{#if short}}alias: '{{short}}',{{/if}}
+        type: '{{type}}',
+        description: '{{escape description}}'{{#if default}}, default: '{{defaultValue}}'{{/if}}
+      })
+      {{/each}}
+      .command('{{#each spec.commands}}{{name}}{{#unless @last}}', '{{@index}}', {{/unless}}{{/each}}', '{{escape description}}', (yargs) => {
+        return yargs
+          {{#each ../spec.commands}}
+          .command('{{name}}', '{{escape description}}', (yargs) => {
+            return yargs
+              {{#each arguments}}
+              .positional('{{name}}', {
+                describe: '{{escape description}}',
+                type: '{{type}}'{{#if required}}, demandOption: true{{/if}}
+              })
+              {{/each}}
+              {{#each options}}
+              .option('{{name}}', {
+                {{#if short}}alias: '{{short}}',{{/if}}
+                describe: '{{escape description}}',
+                type: '{{type}}'
+              })
+              {{/each}}
+          }, (argv) => {
+            console.log('Running {{name}} command');
+          })
+          {{/each}}
+      }, (argv) => {
+        if (argv.version) {
+          console.log('{{spec.name}} v{{spec.version}}');
+        } else {
+          console.log('Use --help to see available commands');
+        }
+      })
+  })
+  .help()
+  .parse();