docs: modernize README with portfolio branding

Author: adab-tech

README.md

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+# Mapping Voices
+
+Digital humanities project for analyzing and visualizing mapped voice data.
+
+[![Portfolio](https://img.shields.io/badge/Adamu_Abubakar-adamu.tech-0f766e?style=flat-square)](https://adamu.tech)
+[![DH](https://img.shields.io/badge/Focus-Digital_Humanities-4f46e5?style=flat-square)](https://adamu.tech)
+
+---
+
+## Overview
+
+Mapping Voices supports exploratory analysis of voice-related humanities datasets with an accessible web front end.
+
+## Features
+
+- Interactive maps and narrative views
+- Static, deployable HTML/JS assets
+- Research-oriented presentation layer
+
+## Quick start
+
+```bash
+git clone https://github.com/adab-tech/mapping.git
+cd mapping
+# Serve locally, e.g. npx http-server -p 8080
+```
+
+## Author
+
+**Adamu Abubakar** · [adamu.tech](https://adamu.tech) · [contact@adamu.tech](mailto:contact@adamu.tech)