docs: adds header file for terraform-docs

Author: nimisha-gj

.header.md

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+# Terraform AWS Organizations Module
+A Terraform module for creating and managing AWS Organizations.
+
+## Available Features
+
+- Organization Creation: Set up AWS Organizations.
+- Account Management: Create and manage member accounts.
+- Organizational Units: Establish and manage organizational units.

modules/account/.header.md

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+# Terraform AWS Organizations Account Module
+A Terraform module for creating and managing AWS Organizations member account.

modules/organizational_unit/.header.md

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+# Terraform AWS Organizational Unit Module
+A Terraform module for creating and managing AWS Organizational Unit.