Update README and COMPLETE_GUIDE

.gitignore

@@ -11,4 +11,4 @@ validator_keyfile.pub
 credentials.json
 config/*
 !config/*template*
-!config/*sample*
+!config/*sample*

GUIDE_COMPLETE.md

@@ -60,6 +60,15 @@ $ ssh-add <path>
 
 Note: The key paths MUST be added to `ssh-add`.
 
+### Provider Account Setup & Configuration
+
+* Create a project in Google Cloud Provider (GCP). This is currently the only supported backend for Terrafrom state changes. Copy the project ID for the next step.
+* Create a project in the cloud Provider account of your choice with the name of the ID that you copied in the GCP project. e.g. `My-Project-1234567`
+    - Note: Under the hood Terraform uses the `projectId` field in your `config/main.json` to store the state using this format.
+* The ssh username in `config.main.json` only works with `root` with some providers such as digitalocean.
+* Inside your `config/main.json` the `machineType` field must have a slug value. e.g. for [DigitalOcean](https://slugs.do-api.dev/). `s-4vcpu-8gb-amd`.
+
+
 ### Synchronization
 
 ```

README.md

@@ -13,7 +13,7 @@ There are two ways of using this repository:
 
 * **Platform & Application Layer**
 
-  Configure credentials for infrastructure providers such as AWS, Azure, GCP
+  Configure credentials for infrastructure providers such as AWS, Azure, GCP, digitalocean,
   and/or Packet, then execute the Terraform process to automatically deploy the
   required machines ([Platform Layer](#platform-layer)) and setup the
   [Application Layer](#application-layer).