Fully-automate development setup with Gitpod

Signed-off-by: Geoffrey Huntley <[email protected]>

.gitpod.Dockerfile

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+FROM node:16-buster

.gitpod.yml

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+image:
+  file: .gitpod.Dockerfile
+
+# List the start up tasks. You can start them in parallel in multiple terminals.
+# https://www.gitpod.io/docs/config-start-tasks/
+tasks:
+  - init: >
+      npm install &&
+      npm run build
+    command: npm run test
+
+# Enable prebuilds of your project to enable faster workspace start times.
+# https://www.gitpod.io/docs/prebuilds/#configure-the-github-app
+github:
+  prebuilds:
+    master: true
+    branches: true
+    pullRequests: true
+    pullRequestsFromForks: true
+    addCheck: true

CONTRIBUTING.md

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+## Hacking on Serverless Workflow Typescript SDK in Gitpod
+
+If you have a web browser, you can get a fully pre-configured development environment in one click:
+
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/serverlessworkflow/sdk-typescript)

README.md

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-![Node CI](https://github.com/serverlessworkflow/sdk-typescript/workflows/Node%20CI/badge.svg)
+![Node CI](https://github.com/serverlessworkflow/sdk-typescript/workflows/Node%20CI/badge.svg) [![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-blue?logo=gitpod)](https://gitpod.io/#https://github.com/serverlessworkflow/sdk-typescript)
 
 # Serverless Workflow Specification - Typescript SDK