add hello-world template

lib/plugins/create/templates/hello-world/gitignore

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+# package directories
+node_modules
+jspm_packages
+
+# Serverless directories
+.serverless

lib/plugins/create/templates/hello-world/handler.js

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+'use strict';
+
+module.exports.helloWorld = (event, context, callback) => {
+  const response = {
+    statusCode: 200,
+    headers: {
+      "Access-Control-Allow-Origin" : "*" // Required for CORS support to work
+    },
+    body: JSON.stringify({
+      message: 'Go Serverless v1.0! Your function executed successfully!',
+      input: event,
+    }),
+  };
+
+  callback(null, response);
+};

lib/plugins/create/templates/hello-world/serverless.yml

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+# Welcome to serverless. Read the docs
+# https://serverless.com/framework/docs/
+
+# Serverless.yml is the configuration the CLI
+# uses to deploy your code to your provider of choice
+
+# The `service` block is the name of the service
+service: serverless-hello-world
+
+# The `provider` block defines where your service will be deployed
+provider:
+  name: aws
+  runtime: nodejs6.10
+
+# The `functions` block defines what code to deploy
+functions:
+  helloWorld:
+    handler: handler.helloWorld
+    # The `events` block defines how to trigger the handler.helloWorld code
+    events:
+      - http:
+          path: hello
+          method: get
+          cors: true