Add resource link

Author: renvins

README.md

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 ServerPulse is an **open-source**, real-time performance monitoring tool for Minecraft servers. It collects key server metrics (TPS, disk usage, memory, player count, entities, chunks, ping) and visualizes them through an integrated Grafana dashboard.
 
+[![Available on Spigot](https://img.shields.io/badge/Available%20on-Spigot-yellow.svg)](https://www.spigotmc.org/resources/serverpulse.12345/)
+
 <details>
 <summary>📊 View Dashboard Examples</summary>