Add Hello World Ruby Example

docs/providers/aws/examples/hello-world/ruby/README.md

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+<!--
+title: Hello World Ruby Example
+menuText: Hello World Ruby Example
+description: Create a Ruby Hello World Lambda function
+layout: Doc
+-->
+
+<!-- DOCS-SITE-LINK:START automatically generated  -->
+### [Read this on the main serverless docs site](https://www.serverless.com/framework/docs/providers/aws/examples/hello-world/ruby/)
+<!-- DOCS-SITE-LINK:END -->
+
+# Hello World Ruby Example
+
+Make sure `serverless` is installed. [See installation guide](../../../guide/installation.md).
+
+Once installed the Serverless CLI can be called with `serverless` or the shorthand `sls` command.
+
+```
+$ sls
+
+Commands
+* You can run commands with "serverless" or the shortcut "sls"
+* Pass "--verbose" to this command to get in-depth plugin info
+* Pass "--no-color" to disable CLI colors
+* Pass "--help" after any <command> for contextual help
+```
+
+## 1. Create a service
+
+```
+sls create --template aws-ruby --path myService
+```
+
+Using the `create` command we can specify one of the available [templates](https://serverless.com/framework/docs/providers/aws/cli-reference/create#available-templates). For this example use aws-ruby with the `--template` or shorthand `-t` flag.
+
+The `--path` or shorthand `-p` is the location to be created with the template service files. Change directories into this new folder.
+
+## 2. Deploy
+
+```
+sls deploy
+```
+
+This will deploy your function to AWS Lambda based on the settings in `serverless.yml`.
+
+## 3. Invoke deployed function
+
+```
+sls invoke -f hello
+```
+
+Invoke deployed function with command `invoke` and `--function` or shorthand `-f`.
+
+In your terminal window you should see the response from AWS Lambda.
+
+```json
+{
+    "statusCode": 200,
+    "body": "\"Go Serverless v1.0! Your function executed successfully!\""
+}
+```
+
+Congrats you have deployed and ran your Hello World function!