Refine TryMe repository README

[mrfloris]

Summary

• add a concise description of TryMe and clarify this repository's issue-tracker role
• retain the official SpigotMC, CMILib, private-message, and Discord routes
• combine repetitive bug and feature-request guidance into one shorter section
• request exact versions, reproduction steps, expected behavior, and relevant logs

Why

This refines the useful README contributed by MrCrazys in #23. It preserves that contribution's intent and support links while making the page easier to scan and the resulting issue reports more actionable.

Changing compatibility details remain on the official SpigotMC resource page so they do not drift in two places.

Validation

• fact-checked product, repository-role, dependency, and support claims against current public project information
• confirmed the proposal against the latest upstream main
• ran git diff --check
• changed only README.md; no plugin source, build, or runtime behavior is affected