Added LiteLLM to the stack

Development/litellm/enterprise/litellm_enterprise/proxy/readme.md

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+# LiteLLM Proxy Enterprise Features - Readme
+
+## Overview
+
+This directory contains enterprise features used on the LiteLLM proxy.
+
+## Format
+
+Create a file for every group of endpoints (e.g. `key_management_endpoints.py`, `user_management_endpoints.py`, etc.)
+
+If there is a broader semantic group of endpoints, create a folder for that group (e.g. `management_endpoints`, `auth_endpoints`, etc.)