Document running lambdas locally vs. testing them in a containerized lambda environment

Author: thekid

README.md

@@ -38,14 +38,25 @@ If you need to run any initialization code, you can do before returning the lamb
 
 Development
 -----------
-To test your lambda locally, run the following:
+To run your lambda locally, use the following:
+
+```bash
+$ xp lambda run Greet '{"name":"Timm"}'
+Hello Timm from PHP 8.2.7 via Greet @ test-local-1
+```
+
+*This does not provide a complete lambda environment, and does not have any execution limits imposed on it!*
+
+Integration testing
+-------------------
+To test your lambda inside a local containerized lambda environment, use the *test* command.
 
 ```bash
 $ xp lambda test Greet '{"name":"Timm"}'
 START RequestId: 9ff45cda-df9b-1b8c-c21b-5fe27c8f2d24 Version: $LATEST
 END RequestId: 9ff45cda-df9b-1b8c-c21b-5fe27c8f2d24
 REPORT RequestId: 9ff45cda-df9b-1b8c-c21b-5fe27c8f2d24  Init Duration: 922.19 ms...
-"Hello Timm from PHP 8.0.10 via test @ us-east-1"
+"Hello Timm from PHP 8.2.7 via test @ us-east-1"
 ```
 
 *This functionality is provided by the [AWS Lambda base images for custom runtimes](https://gallery.ecr.aws/lambda/provided)*