feat: add another demo module null/random (#4)

- Introduced a new demo module for testing purposes.
- This module will be used for random functionality testing.

Author: virgofx

null/random/README.md

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+# Null Random Sample Terraform module
+
+Returns a random string
+
+This is a demo Terraform module.

null/random/main.tf

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+resource "random_string" "random" {
+  length           = 16
+  special          = true
+  override_special = "/@£$"
+}

null/random/outputs.tf

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+output "random_string" {
+  description = "Random string value"
+  value       = random_string.random.result
+}

null/random/variables.tf

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+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {}
+}