Add README documentation

Author: Tom Osowski

app/ruby/app-issue-creator/README.md

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+# app-issue-creator
+
+This is the sample project that walks through creating a GitHub App and configuring a server to listen to [`installation` events](https://developer.github.com/v3/activity/events/types/#installationevent). When an App is added to an account, it will create an issue in each repository with a message, "added new app!".
+
+## Requirements
+
+* Ruby installed
+* [Bundler](http://bundler.io/) installed
+* [ngrok](https://ngrok.com/) or [localtunnel](https://localtunnel.github.io/www/) exposing port `4567` to allow GitHub to access your server
+
+## Set up a GitHub App
+
+* [Set up and register GitHub App](https://developer.github.com/apps/building-integrations/setting-up-and-registering-github-apps/)
+* [Enable `issue` write permissions](https://developer.github.com/v3/apps/permissions/#permission-on-issues)
+* If not running on a public-facing IP, use ngrok to generate a URL as [documented here](https://developer.github.com/v3/guides/building-a-ci-server/#writing-your-server)
+
+## Install and Run project
+
+Install the required Ruby Gems by entering `bundle install` on the command line. 
+
+To start the server, type `ruby server.rb` on the command line.
+
+The [sinatra server](http://www.sinatrarb.com/) will be running at `localhost:4567`.
+
+[basics of auth]: http://developer.github.com/guides/basics-of-authentication/