Implement .env configuration

README.md

@@ -44,6 +44,15 @@ export VOIPMS_API_USERNAME='you@example.com'
 export VOIPMS_API_PASSWORD='your-api-password'
 ```
 
+It also loads a project-root `.env` file when present:
+
+```bash
+cp .env-example .env
+```
+
+Values already exported in the process environment, and values passed with CLI
+options, take precedence over `.env` values.
+
 Credentials can also be passed directly:
 
 ```bash
@@ -51,6 +60,7 @@ Credentials can also be passed directly:
 ```
 
 The endpoint can be overridden with `VOIPMS_API_ENDPOINT` or `--endpoint`.
+CDR timezone defaults can be set with `VOIPMS_TIMEZONE`.
 
 ## CLI Overview
 
@@ -261,9 +271,8 @@ be run behind a trusted network, firewall, VPN, or tunnel.
 Start it with:
 
 ```bash
-export VOIPMS_API_USERNAME='you@example.com'
-export VOIPMS_API_PASSWORD='your-api-password'
-export MCP_AUTH_TOKEN='choose-a-long-random-token'
+cp .env-example .env
+# Edit .env and optionally add MCP_AUTH_TOKEN='choose-a-long-random-token'
 
 ./bin/serve-mcp.sh
 ```