add claude file and update readme (#21)

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This repository contains a CS Repro Mattermost environment - a reproduction of a standard Mattermost customer production environment with preconfigured SAML, LDAP, Advanced Logging, Prometheus, Grafana, Elasticsearch, and read replicas. It is designed for testing and reproducing customer environments.
+
+## Environment Setup
+
+### Prerequisites
+
+You need to have Docker and Docker Compose installed on your machine to run this environment.
+
+### Initial Setup
+
+1. Add an enterprise license file named `license.mattermost` to the root directory
+2. Run `make run` to start the core services
+
+## Common Commands
+
+### Environment Management
+
+- `make run` - Initialize environment and create containers
+- `make run-all` - Spin up all environment containers (with DB replicas and Mattermost HA)
+- `make run-db-replicas` - Add database replicas to the environment
+- `make run-mm-replicas` - Add Mattermost HA nodes to the environment
+- `make run-rtcd` - Launch RTCD service for Mattermost Calls
+- `make start` - Start existing containers
+- `make stop` - Stop all running containers
+- `make restart` - Restart all containers
+- `make restart-mattermost` - Restart only Mattermost containers (preferred for testing changes)
+- `make backup-keycloak` - Generate a backup of the current Keycloak setup
+- `make restore-keycloak` - Restore Keycloak data from an existing backup
+- `make reset` - Clean volumes directory and reinitialize the environment
+- `make delete-data` - Clear all data within volumes
+- `make nuke` - Erase all configurations and data
+- `make nuke-rmi` - Complete cleanup including removing Docker images
+
+### Upgrading and Downgrading
+
+To upgrade Mattermost:
+1. Modify the image tag in `docker-compose.yml`
+2. Run `make restart-mattermost`
+
+To downgrade Mattermost:
+1. Modify the image tag in `docker-compose.yml`
+2. Run `make downgrade`
+
+## Component Access
+
+### Mattermost
+
+- URL: http://localhost:8065
+- Default credentials available in the accounts section below
+
+### LDAP
+
+- Admin access: `cn=admin,dc=planetexpress,dc=com` / `GoodNewsEveryone`
+- Commands for LDAP operations are in the README.md
+
+### Grafana
+
+- URL: http://localhost:3000
+- Credentials: admin / admin
+
+### Elasticsearch
+
+- URL: http://localhost:9200
+
+### mitmproxy
+
+- URL: http://localhost:8181
+
+## Account Information
+
+| Username  | Password  | Role in Mattermost | Can use LDAP? | Can use SAML? |
+|-----------|-----------|-------------------|---------------|---------------|
+| admin     | admin     | n/a               | n/a           | n/a           |
+| professor | professor | Sys Admin         | Yes           | Yes           |
+| bender    | bender    | Member            | Yes           | Yes           |
+| hermes    | hermes    | Sys Admin         | Yes           | Yes           |
+| fry       | fry       | Member            | Yes           | Yes           |
+| leela     | leela     | Member            | Yes           | Yes           |
+| zoidberg  | zoidberg  | Member            | Yes           | Yes           |
+| amy       | amy       | Member            | Yes           | Yes           |
+
+## Database Information
+
+- Primary PostgreSQL: `postgresql://mmuser:mmuser_password@localhost:5432/mattermost`
+- Replica 1: `postgresql://mmuser:mmuser_password@localhost:5433/mattermost`
+- Replica 2: `postgresql://mmuser:mmuser_password@localhost:5434/mattermost`