feat: Create SubdomainIdentifierGenerator

To be used when creating pods.

test/unit/pods/generate/SubdomainIdentifierGenerator.test.ts

@@ -0,0 +1,14 @@
+import { SubdomainIdentifierGenerator } from '../../../../src/pods/generate/SubdomainIdentifierGenerator';
+
+describe('A SubdomainIdentifierGenerator', (): void => {
+  const base = 'http://test.com/';
+  const generator = new SubdomainIdentifierGenerator(base);
+
+  it('generates identifiers by using the slug as subdomain.', async(): Promise<void> => {
+    expect(generator.generate('slug')).toEqual({ path: 'http://slug.test.com/' });
+  });
+
+  it('converts slugs using punycode.', async(): Promise<void> => {
+    expect(generator.generate('sàl/u㋡g')).toEqual({ path: 'http://s-l-u-g.test.com/' });
+  });
+});