Add teaser for offline testing (#141)

* add offline testing note

* Update README.md

Co-authored-by: Simon Shillaker <554768+Shillaker@users.noreply.github.com>

* Update README.md

Co-authored-by: Simon Shillaker <554768+Shillaker@users.noreply.github.com>

* review

Co-authored-by: Simon Shillaker <554768+Shillaker@users.noreply.github.com>

Author: thomas-tacquet

README.md

@@ -61,6 +61,7 @@ Serverless Framework handles everything from creating namespaces to function/cod
     - [Deployment methods](#deployment-methods)
     - [Managing containers](#managing-containers)
   - [Logs](#logs)
+  - [Offline testing](#offline-testing)
   - [Info](#info)
   - [Documentation and useful links](#documentation-and-useful-links)
   - [Contributing](#contributing)
@@ -486,6 +487,10 @@ You can fetch the logs of a specific function for with the `--function` option.
 serverless logs --function <function_or_container_name>
 ```
 
+## Offline testing
+
+Deploying functions locally provides a shorter development feedback loop, allowing for faster testing and debugging. This is something we are actively working on, so watch this space!
+
 ## Info
 
 The `serverless info` command gives you information about your functions' or containers' current deployement state in JSON format.