adding READMEs to examples

examples/additional-ip-addresses/README.md

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+# Additional IP addresses example
+
+This example shows how to add additional IP addresses to the certifcate using the module.
+
+```hcl
+terraform {
+  required_version = ">= 0.12.31"
+  required_providers {
+    google = {
+      version = "~> 3.69"
+    }
+  }
+}
+
+provider "google" {
+  project = var.project_id
+  region  = var.project_region
+}
+
+data "google_project" "project" {}
+
+resource "google_service_account" "test" {
+  account_id = "test-account"
+}
+
+resource "google_compute_address" "test" {
+  name         = "test-ip"
+  address_type = "EXTERNAL"
+}
+
+module "tls_cert" {
+  source = "devops-rob/tls/gcp"
+
+  project_id            = var.project_id
+  region                = var.project_region
+  service_account_email = google_service_account.test.email
+  tls_bucket            = "test-tls-bucket"
+  tls_cert_name         = "devopsrob"
+
+  ip_addresses = [
+    google_compute_address.test.address,
+    "127.0.0.1",
+  ]
+}
+```

examples/certificate-authority-subject-example/README.md

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+# Updated Certficate Authority example
+
+This example shows how to specify the Certificate Authority subject in the module.
+
+```hcl
+terraform {
+  required_version = ">= 0.12.31"
+  required_providers {
+    google = {
+      version = "~> 3.69"
+    }
+  }
+}
+
+provider "google" {
+  project = var.project_id
+  region  = var.project_region
+}
+
+data "google_project" "project" {}
+
+variable "project_id" {}
+variable "project_region" {}
+
+resource "google_service_account" "test" {
+  account_id = "test-account"
+}
+
+module "tls_cert" {
+  source = "devops-rob/tls/gcp"
+
+  project_id            = var.project_id
+  region                = var.project_region
+  service_account_email = google_service_account.test.email
+  tls_bucket            = "test-tls-bucket"
+  tls_cert_name         = "devopsrob"
+
+  tls_ca_subject = {
+    common_name         = "HashiCorp Inc. Root"
+    organization        = "HashiCorp, Inc"
+    organizational_unit = "Department of Certificate Authority"
+    street_address      = ["123 Hashi Street"]
+    locality            = "The Internet"
+    province            = "London"
+    country             = "UK"
+    postal_code         = "SW1 2EG"
+  }
+
+}
+```

examples/minimal-example/README.md

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+# Minimal exmample
+
+This example shows a minimal way of using the module with all of the default variavle values.
+
+```hcl
+terraform {
+  required_version = ">= 0.12.31"
+  required_providers {
+    google = {
+      version = "~> 3.69"
+    }
+  }
+}
+
+provider "google" {
+  project = var.project_id
+  region  = var.project_region
+}
+
+data "google_project" "project" {}
+
+variable "project_id" {}
+variable "project_region" {}
+
+resource "google_service_account" "test" {
+  account_id = "test-account"
+}
+
+module "tls_cert" {
+  source = "devops-rob/tls/gcp"
+
+  project_id            = var.project_id
+  region                = var.project_region
+  service_account_email = google_service_account.test.email
+  tls_bucket            = "test-tls-bucket"
+  tls_cert_name         = "devopsrob"
+}
+```