fix(docs): Added README.md

README.md

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+# prometheus_exporter_gpu
+
+![Phorge logo](https://avatars.githubusercontent.com/u/187407936?s=200&v=4)
+
+Simple Prometheus exporter that collects and exposes GPU metrics from the local host for scraping by Prometheus.
+
+## Features
+- Exposes GPU utilization, memory, temperature and driver information.
+- HTTP metrics endpoint compatible with Prometheus (/metrics).
+- Small, single-binary or container-friendly.
+
+## Prerequisites
+- [Docker](https://docker.com)
+
+## Quick start
+
+```bash
+docker compose up -d
+```
+
+Default metrics endpoint: http://localhost:8000/metrics
+
+## Metrics
+
+Exposed metrics:
+- power_w
+- gpu_temp_c
+- gpu_clock_mhz
+- mem_clock_mhz
+- fan_speed_percent
+- gpu_util_percent
+- mem_util_percent
+- memory_used_mib
+- memory_total_mib
+
+Check /metrics for the full list from the running exporter.
+
+## Prometheus scrape config (example)
+```yml
+- job_name: 'gpu_exporter'
+    static_configs:
+        - targets: ['host.example:8000']
+```