Add initial version of wordpress interview exercise

.gitignore

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+.idea
+db_data/*
+!db_data/.gitkeep
+wordpress_data/*
+!wordpress_data/.gitkeep

README.md

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+# Countingup Wordpress Exercise
+
+## Overview
+Thank you for choosing to interview with Countingup for our Wordpress Developer role. We hope you find the experience 
+interesting and rewarding.
+
+Our technical interview takes the form of a pairing exercise, where you will be expected to work with a member of our
+team to code a solution to the problem outlined in the exercise you will be given. There will then be a some follow up
+questions and an opportunity for you to ask us questions too. Whils the core problem to be solved is relatively trivial,
+the exercise is designed for you to showcase your skills and to demonstrate how quickly you can learn something new.
+
+## Prerequisites 
+We would ask that you have [docker compose](https://docs.docker.com/compose/install/) installed and that you choose an
+appropriate IDE to implement your solution.

apiservice/mock-service.yml

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+
+- name: Send text for number
+  serveOnly: true
+  request:
+    method: POST
+    serveEndpoint: /api/send-text
+    body: { number: "+447700900123" }
+  response:
+    code: 200
+    headers:
+      content-type: application/json
+    serveBody:
+      {
+        messageId: "123456789",
+      }
+
+- name: Send text for unknown number
+  serveOnly: true
+  request:
+    method: POST
+    serveEndpoint: /api/send-text
+  response:
+    code: 401
+    headers:
+      content-type: application/json
+    serveBody:
+      {
+        error: "Invalid number"
+      }

custom_blocks/plugin.php

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+<?php
+/**
+* Plugin Name: My Custom Blocks
+* Description: Add custom blocks
+* Version: 1.0.0
+*/

docker-compose.yml

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+version: "3.9"
+
+services:
+  db:
+    image: mysql:5.7
+    volumes:
+      - ./db_data:/var/lib/mysql
+    restart: always
+    environment:
+      MYSQL_ROOT_PASSWORD: somewordpress
+      MYSQL_DATABASE: wordpress
+      MYSQL_USER: wordpress
+      MYSQL_PASSWORD: wordpress
+
+  apiservice:
+    image: node:16-alpine3.11
+    volumes:
+      - ./apiservice:/apiservice
+    command: npx ncdc serve /apiservice/mock-service.yml
+    ports:
+      - "8001:4000"
+
+  wordpress:
+    depends_on:
+      - db
+      - apiservice
+    image: wordpress:latest
+    volumes:
+      - ./wordpress_data:/var/www/html
+      - ./custom_blocks:/var/www/html/wp-content/plugins/custom_blocks
+    ports:
+      - "8000:80"
+    restart: always
+    environment:
+      WORDPRESS_DB_HOST: db:3306
+      WORDPRESS_DB_USER: wordpress
+      WORDPRESS_DB_PASSWORD: wordpress
+      WORDPRESS_DB_NAME: wordpress