doc: add usage example

examples/basic/README.md

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+# Basic usage
+
+This example shows a basic usage of the Nebuly's platform GCP Terraform module.

examples/basic/main.tf

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+# ------ Variables ------ #
+variable "region" {
+  type    = string
+  default = "us-central1"
+}
+variable "project" {
+  type = string
+}
+
+
+# ----------- Terraform setup ----------- #
+terraform {
+  required_version = ">1.8"
+  required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = "~>6.3"
+    }
+  }
+}
+provider "google" {
+  region  = var.region
+  project = var.project
+}
+
+
+# ------ Main ------ #
+module "nebuly" {
+  source  = "nebuly-ai/nebuly-platform/gcp"
+  version = "~0.1.0"
+
+  region          = var.region
+  resource_prefix = "dev-"
+
+  gke_cluster_admin_users = [
+    "[email protected]",
+  ]
+
+  openai_api_key              = "my-key"
+  openai_endpoint             = "https://api.openai.com"
+  openai_gpt4_deployment_name = "gpt-4"
+  nebuly_credentials = {
+    client_id     = "<your-nebuly-client-id>"
+    client_secret = "<your-nebuly-client-secret>"
+  }
+}
+
+
+# ------ Outputs ------ #
+output "helm_values_bootstrap" {
+  value       = module.nebuly.helm_values_bootstrap
+  sensitive   = true
+  description = <<EOT
+  The `bootrap.values.yaml` file for installing the Nebuly Boostrap GCP chart with Helm.
+  EOT
+}
+output "helm_values" {
+  value       = module.nebuly.helm_values
+  sensitive   = true
+  description = <<EOT
+  The `values.yaml` file for installing Nebuly with Helm.
+
+  The default standard configuration is used, which uses Nginx as ingress controller and exposes the application to the Internet. This configuration can be customized according to specific needs.
+  EOT
+}
+output "secret_provider_class" {
+  value       = module.nebuly.secret_provider_class
+  sensitive   = true
+  description = "The `secret-provider-class.yaml` file to make Kubernetes reference the secrets stored in the Secrets Managethe Secrets Manager."
+}
+output "gke_cluster_get_credentials" {
+  description = "Command for getting the credentials for accessing the Kubernetes Cluster."
+  value       = module.nebuly.gke_cluster_get_credentials
+}