Description for how to obtain credentials from ghost platform (#194)

Refer #193

docs/resources/ghost_resource.md

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-No Documentation Provided by Author
+[Ghost](https://ghost.org/) is an open-source blog and membership application.
+
+# Resource configuration and set-up
+
+To add a Ghost resource, you need to create a custom integration for your Ghost website.
+
+1. **api_url** - this is the API URL.
+2. **api_key** - this is the Admin API key.
+
+# Adding a Custom Integration to Your Ghost Website
+
+1. Navigate to the admin section of your Ghost website and go to settings.
+2. In the advanced section of settings, click on the custom tab under integrations.
+3. Create a new custom integration by clicking on the "Add Custom Integration" button.
+4. Give your custom integration a name.
+5. At this stage, your **api_url** and **api_key** will be displayed.
+6. Finally, click "Save & Close" to complete setting up your Ghost custom integration.
+
+For more details, you can refer to the following help articles:
+
+* [Custom Integrations + Ghost](https://ghost.org/integrations/custom-integrations/)