Add config.example.py with detailed Keycloak setup instructions

prerequisites/config.example.py

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+# Zerto API Configuration - EXAMPLE FILE
+# 
+# INSTRUCTIONS FOR BEGINNERS:
+# 1. Copy this file to config.py: cp config.example.py config.py
+# 2. Edit config.py with your actual ZVM details
+# 3. Never commit your real config.py file (it contains secrets!)
+#
+# WHERE TO GET THESE VALUES:
+# - ZVM_HOST: Ask your Zerto administrator for the ZVM IP address or hostname
+# - CLIENT_ID: Create this in Keycloak (see Keycloak setup instructions)
+# - CLIENT_SECRET: Generated when you create the client in Keycloak
+
+# ZVM Connection Details
+ZVM_HOST = "192.168.111.20"  # ← REPLACE: Your ZVM IP address (e.g., "10.0.0.100")
+ZVM_PORT = 443                # ← USUALLY KEEP AS IS: Default HTTPS port
+ZVM_SSL_VERIFY = False        # ← USUALLY KEEP AS IS: Set to False for self-signed certificates
+
+# Keycloak Authentication
+CLIENT_ID = "sdk-api"         # ← REPLACE: Your Keycloak client ID (e.g., "my-api-client")
+CLIENT_SECRET = "your-secret-here"  # ← REPLACE: Your Keycloak client secret
+
+# Optional: Proxy settings if needed (usually not required)
+# PROXY = {
+#     "http": "http://proxy.example.com:8080",
+#     "https": "https://proxy.example.com:8080"
+# }
+
+# ========================================
+# KEYCLOAK SETUP INSTRUCTIONS:
+# ========================================
+# 1. Open your browser and go to: https://YOUR_ZVM_IP/auth
+# 2. Login with your Zerto admin credentials
+# 3. In the left menu, click "Clients"
+# 4. Click "Create" button
+# 5. Fill in:
+#    - Client ID: Choose a name (e.g., "python-sdk-client")
+#    - Client Name: Same as Client ID
+# 6. Click "Next"
+# 7. Enable these options:
+#    - Client authentication: ON
+#    - Authorization: ON
+#    - Standard flow: ON
+#    - Direct access grants: ON
+#    - Implicit flow: ON
+#    - OAuth 2.0 Device Authorization Grant: ON
+# 8. Click "Next" then "Save"
+# 9. Go to "Service account roles" tab
+# 10. Click "Assign role" and select "admin"
+# 11. Go to "Credentials" tab
+# 12. Copy the "Client Secret" value
+# 13. Use the Client ID and Client Secret in your config.py