docs: Add error tracking overview and details to errors.md

docs/src/fancyanalytics/features/errors.md

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-TODO
+# Errors
+
+Our analytics platform supports error and exception tracking across all projects.
+
+Errors are structured records of exceptions that occur in your applications. 
+They help you **debug**, **monitor stability**, and **gain insights into failure patterns**.
+
+
+## What is an Error?
+
+An **error** represents a crash, exception, or runtime issue that happened inside an application. It includes:
+
+- A **timestamp**
+- The **exception class** (e.g. `NullPointerException`)
+- The **exception message**
+- The **stack trace**
+- Optional **custom properties** for extra context