Added koa-shell Example Repositories (#144)

Koa-shell  is a structured sample skeleton application for microservices and api development with Koa

Author: spmsupun

Readme.md

@@ -56,6 +56,7 @@ npm run lint
  - [hacknical](https://github.com/ecmadao/hacknical) - A website for github user to make a better resume, based on Koa v2, redis and mongoose.
  - [koa-vue-notes-api](https://github.com/johndatserakis/koa-vue-notes-api) - A fleshed-out SPA using Koa 2.3 on the backend and Vue 2.4 on the frontend. Includes fully featured user-authentication components, CRUD actions for the user's notes, and async/await.
  - [koa-typescript-node](https://github.com/Talento90/typescript-node) - Template for building nodejs and typescript services. Features: MySql, Migrations, Docker, Unit & Integration Tests, JWT authentication, authorization, graceful shutdown, Prettier.
+ - [koa-shell](https://github.com/lifeeka/koa-shell) - Structured sample skeleton application for microservices and api development with Koa.
 
 ## Boilerplates