Add-diagram (#6)

* Bump node-fetch from 2.6.6 to 2.6.7

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) from 2.6.6 to 2.6.7.
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@v2.6.6...v2.6.7)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

* Update to 0.1.5 due to node-fetch upgrade

* Updated version in README

* Update to 0.1.5

* Add diagram and blogpost

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

README.md

@@ -8,6 +8,8 @@ A GitHub Action to use the [Ably Control API](https://ably.com/documentation/con
 * Create an Ably application.
 * Add an API key to an application, with a list of capabilities.
 
+![Control API GitHub Action diagram](ably-control-api-action.png)
+
 ## Usage
 
 ### Inputs
@@ -87,4 +89,6 @@ It is important to keep the `account-id` and `control-api-key` inputs secret, as
 
 ## More information
 
+To learn more about Infrastructure as Code, GitHub workflows & actions read [this blog post](https://ably.com/blog/infrastructure-as-code-ably-control-api-github-action).
+
 For more information about the Ably Control API please see the [Ably docs](https://ably.com/documentation/control-api).