docs: Add logs.md

docs/src/fancyanalytics/features/logs.md

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+# Logs (soon)
+
+Our analytics platform supports **structured logging** — a powerful way to capture detailed logs with context for debugging, monitoring, and analysis.
+Structured logs go beyond plain text by capturing logs in a **machine-readable, structured format** with support for levels, timestamps, and custom properties.
+
+## 💡 What is a Structured Log?
+
+A **structured log** is:
+
+- A **timestamped message**
+- With a **log level** (e.g. `INFO`, `WARN`, `ERROR`)
+- And **optional structured properties** (key-value pairs)
+
+This makes logs **queryable**, **filterable**, and easy to **analyze programmatically**.