feat: add guilds and channels CRUD (#14)

cypress/fixtures/guilds/[guildId]/channels/post.ts

@@ -0,0 +1,15 @@
+import { guildExample } from '../../guild'
+import { Handler } from '../../../handler'
+import { channelExample, channelExample2 } from '../../../channels/channel'
+
+export const postChannelsWithGuildIdHandler: Handler = {
+  method: 'POST',
+  url: `/guilds/${guildExample.id}/channels`,
+  response: {
+    statusCode: 200,
+    body: {
+      ...channelExample2,
+      defaultChannelId: channelExample.id
+    }
+  }
+}