Add Heroku deploy instructions

Procfile

@@ -0,0 +1 @@
+worker: node run.js

README.md

@@ -17,6 +17,12 @@
 
 The easiest installation mode is to set up an instance of Nightscout [cgm-remote-monitor] on Azure and enable the `mmconnect` plugin. This module is packaged with Nightscout 0.8.2+ and can pull data from CareLink Connect as part of the web server process. Follow [this guide][azure-install].
 
+## Installation on Heroku
+
+Another turnkey installation option is to run this on a Heroku worker dyno. You may find this more affordable than Azure. Follow the [Share2 Bridge instructions for Heroku], substituting this repo for `share2nightscout-bridge`.
+
+[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy)
+
 ## Installation in general
 
 1. Install [Node].
@@ -84,6 +90,7 @@ This project is intended for educational and informational purposes only. It rel
 [Nightscout]: http://www.nightscout.info/
 [cgm-remote-monitor]: https://github.com/nightscout/cgm-remote-monitor
 [azure-install]: http://www.nightscout.info/wiki/welcome/website-features/funnel-cake-0-8-features/minimed-connect-and-nightscout
+[Share2 Bridge instructions for Heroku]: https://github.com/bewest/share2nightscout-bridge/wiki/Deploy-to-Heroku
 [Node]: https://nodejs.org
 [download a zip]: https://github.com/mddub/minimed-connect-to-nightscout/archive/master.zip
 [azure-environment]: https://github.com/projectkudu/kudu/wiki/Azure-runtime-environment

app.json

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+{
+  "name": "MiniMed Connect to Nightscout",
+  "repository": "https://github.com/mddub/minimed-connect-to-nightscout",
+  "env": {
+    "CARELINK_USER_NAME": {
+      "description": "Your username for CareLink (https://carelink.minimed.com)",
+      "value": "",
+      "required": true
+    },
+    "CARELINK_PASSWORD": {
+      "description": "Your password for CareLink (https://carelink.minimed.com)",
+      "value": "",
+      "required": true
+    },
+    "API_SECRET": {
+      "description": "This must match the API_SECRET password from your Nightscout website",
+      "value": "",
+      "required": true
+    },
+    "WEBSITE_HOSTNAME": {
+      "description": "The host name for your Nightscout instance, for example yoursite.herokuapp.com or yoursite.azurewebsites.net. Do not include http:// or https://.",
+      "value": "",
+      "required": true
+    },
+    "CARELINK_REQUEST_INTERVAL": {
+      "description": "OPTIONAL: number of milliseconds to wait between requests to the CareLink server (default: 60000)",
+      "value": "",
+      "required": false
+    },
+    "CARELINK_SGV_LIMIT": {
+      "description": "OPTIONAL: maximum number of recent sensor glucose values to send to Nightscout (default: 24)",
+      "value": "",
+      "required": false
+    },
+    "CARELINK_MAX_RETRY_DURATION": {
+      "description": "OPTIONAL: maximum number of seconds to spend retrying failed requests to CareLink, ideally a power of 2 (default: 512)",
+      "value": "",
+      "required": false
+    },
+    "CARELINK_QUIET": {
+      "description": "OPTIONAL: set to a truthy value to not output details of CareLink and Nightscout requests to the console (default: empty)",
+      "value": "",
+      "required": false
+    },
+    "NS": {
+      "description": "OPTIONAL: a fully-qualified Nightscout URL (e.g. https://sitename.azurewebsites.net) which overrides WEBSITE_HOSTNAME",
+      "value": "",
+      "required": false
+    }
+  },
+  "addons": [
+    "papertrail"
+  ]
+}