add cron example

docs/02-providers/aws/examples/cron/README.md

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+<!--
+title: Serverless Scheduled Cron Example
+menuText: Scheduled Cron Example
+description: Create a serverless scheduled cron job
+layout: Doc
+-->
+
+# Schedule Cron
+
+Create a scheduled task with AWS lambda and automate all teh things!
+
+For more information on running cron with serverless check out the [Tutorial: Serverless Scheduled Tasks](https://parall.ax/blog/view/3202/tutorial-serverless-scheduled-tasks) by parrallax.

docs/02-providers/aws/examples/cron/node/README.md

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+<!--
+title: Node Lambda Scheduled Cron Example
+menuText: Scheduled Cron Example
+description: Create a serverless scheduled cron job with nodejs and aws lambda
+layout: Doc
+-->
+
+# AWS Lambda Node Cron Function
+
+This is an example of creating a function that runs on a scheduled cron.
+
+To see your cron running tail your logs with:
+
+```bash
+serverless logs -function cron -tail
+```
+
+[Tutorial: Serverless Scheduled Tasks](https://parall.ax/blog/view/3202/tutorial-serverless-scheduled-tasks)

docs/02-providers/aws/examples/cron/node/handler.js

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+'use strict'
+
+module.exports.run = (event, context, callback) => {
+  const time = new Date()
+  console.log(`Your cron ran ${time}`)
+}

docs/02-providers/aws/examples/cron/node/serverless.yml

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+service: cron-example   # This is the name of your service
+provider:
+  name: aws             # This is the provider we’re deploying to
+  runtime: nodejs4.3    # You have a choice of Node, Java, or
+                        # Python, but you can run native binaries too
+functions:
+  cron:
+    handler: handler.run  # This will require the handler.js file,
+                          # and execute the exported run function
+    events:
+      - schedule: rate(1 minute)