Add examples contributing

Author: flochaz

CONTRIBUTING.md

@@ -57,6 +57,27 @@ You can build and start a local docs website by running these two commands.
   - `npm run docs-buildDockerImage` OR `docker build -t squidfunk/mkdocs-material ./docs/`
   - `npm run docs-runLocalDocker` OR `docker run --rm -it -p 8000:8000 -v ${PWD}:/docs squidfunk/mkdocs-material`
 
+### Examples
+
+As part of the repo you will find an examples folder at the root. This folder contains examples (written with CDK for now) of deployable lambdas using powertools lib.
+
+To test your updates with this examples you just have to:
+
+1. Build your local version of *aws-lambda-powertools-typescript* npm packages with `npm run lerna-package`
+1. Update their references in examples
+    ```
+    cd examples/cdk
+    npm install ../../packages/**/dist/aws-lambda-powertools-*
+    ```
+1. Run cdk tests
+    ```
+    npm run test
+    ```
+1. Deploy
+    ```
+    npm run cdk deploy
+    ```
+
 ### Conventions
 
 Category | Convention