Initialize terraform plan with auth details

src/ASSIGNMENT-03/ASSIGNMENT-03.md

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+# 3rd Assignment
+
+## Main Challanges
+
+My main challange is the lack of experience with Azure envrionments.
+
+However, the requiremetns were pretty straight forward, and so, I
+started with reviewing the tools available to work with terrafom and
+Azure.
+The tool that seems to be a good fit, is the [aztexport](https://github.com/Azure/aztfexport)
+utility, which exports an existing azure state into a collecton of
+terraform plan files.
+
+This helped me with understanding the particulars of the environment.

src/ASSIGNMENT-03/init.tf

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+terraform {
+  required_providers {
+    azurerm = {
+      source = "hashicorp/azurerm"
+      version = "~>2.0"
+    }
+
+    random = {
+      source  = "hashicorp/random"
+      version = "~>3.0"
+    }
+  }
+}
+
+provider "azurerm" {
+  features {}
+
+  subscription_id   = "ced61991-09cf-4e19-a773-fa454609e1ed"
+  tenant_id         = "6b4b1b0d-23f1-4063-bbbd-b65e2984b893"
+  # Client ID of SzTerraform service-prinicipal:
+  # Azure Active Directory -> App registration -> SzTerraform
+  client_id         = "0de043f8-9006-4791-baa1-f48a60809c1c"
+  client_secret     = local.secret
+}

src/ASSIGNMENT-03/local.init.tf.template

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+# Copy this file into local.init.tf (which is in .gitignore) as fill
+# in the secret's value
+
+locals {
+  # Secret for the SzTerraform service-prinicipal:
+  # Azure Active Directory -> App registration -> SzTerraform -> Certificates & secrets
+  secret = "<Secret>"
+}