Update README.md

[jmorascalyr]

Jira Link: https://sentinelone.atlassian.net/browse/{TICKET}

🥅 Goal

to help splunk admins understand the RBAC permissions required to run this.

🛠️ Solution

Simple documentation update

🏫 Testing

Went into splunk and wittled down the permissions until they broke and honed in the permissions that were required.