Add README md file

Instructions about the usage of the script provided for assessing the given table growth

Author: nvprav

Server-Side Components/Background Scripts/Table Growth Analysis/README.md

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+# Table Size Analysis Script
+
+This script checks the number of records in selected ServiceNow tables and shows how many were created in the last 30 days.
+
+## Tables Checked
+- `task`
+- `cmdb_ci`
+- `sc_cat_item`
+
+## What It Does
+- Logs the start of the analysis.
+- Counts total records in each table.
+- Counts records created in the last 30 days.
+- Logs both counts to the system log.
+
+## How to Use
+1. Add or remove table names in the `tablesToCheck` list.
+2. Run the script in a background script or scheduled job.