Add remove-outside-collaborator listing

Add my remove outside collaborator probot application to the listing page.

_apps/remove-outside-collaborators.md

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+---
+# A human-friendly name of your listing
+title: Remove Outside Collaborators
+# A short description of what your app does
+description: A GitHub Probot App that monitors and instantly removes any outside collaborators added to your Organization.
+# The slug of your hosted app on GitHub (https://github.com/apps/YOUR-SLUG)
+slug: remove-outside-collaborators
+# Include a few screenshots that show your app in action
+screenshots:
+- https://user-images.githubusercontent.com/7875028/44161123-6548c900-a08a-11e8-82c3-adc890d61ec0.png
+- https://user-images.githubusercontent.com/7875028/44161210-a17c2980-a08a-11e8-8adc-3ef69031d67c.png
+# The GitHub usernames of anyone who authored the app
+authors: [ hollywood ]
+# The repository where the code is located
+repository: hollywood/remove-outside-collaborators
+# The address where this app is deployed
+host: https://remove-outside-collaborators.herokuapp.com/probot
+---
+
+# Remove Outside Collaborators Probot App
+
+A GitHub Probot App that monitors and instantly removes any Outside Collaborators added to your Organization.
+
+## Features
+
+- Will automatically remove any outside collaborators from an organization.
+- Will create an issue in the repo explaining the action.
+- Monitor only mode will not remove any collaborators but will still create an issue.
+- Can set configuration parameters by using YAML file set in a specific repo for the entire org.
+- Can exclude certain members so that they can be added as outside collaborators.
+- Can set a list of users/groups to cc on every issue created
+
+## Get Started
+
+1. [Configure the GitHub App](https://github.com/apps/remove-outside-collaborators)
+2. [Recommended] Create repo named `org-settings` and in it a file `.github/remove-outside-collaborators.yml` as described in the [How it Works](#How-it-Works) section to configure settings (and override defaults)
+3. It will then prevent any outside collaborators (other than any whitelisted members) from being added to your organization.
+
+## How it Works
+
+By default when an Outside Collaborator is added to a Repository, an Issue will be created in the Repository with a warning that a Collaborator was added. [Monitor-Only mode is enabled by default].
+
+A `.github/remove-outside-collaborators.yml` file in the Repository `org-settings` is recommended to override the [default settings](./lib/defaults.js). This Repository will contain global settings for the Organization. You can name the settings Repository anything you'd like, `org-settings` is just the default.
+
+```yml
+# Configuration for Remove-Outside-Collaborators
+
+# Turn on Monitor Mode [SET ON BY DEFAULT]. In this mode Collaborators are not removed, only an Issue is created
+monitorOnly: true
+
+# Enables detection and removal of any Outside Collaborator being added to the assigned repositories
+enableCollaboratorRemoval: true
+
+# Issue Title when an Outside Collaborator is added
+removedIssueTitle: '[CRITICAL] An Outside Collaborator has been added to this Repository!'
+
+# Issue Body when an Outside Collaborator is added
+removedIssueBody: 'NOTE: Outside Collaborators are disabled for this organization! <br/> This member has been removed. Please contact an admin to override.'
+
+# Issue Title when monitor mode is enabled
+monitorIssueTitle: '[CRITICAL] Outside Collaborator Added'
+
+# Issue Body when monitor mode is enable
+monitorIssueBody: 'Please note that the adding of Outside Collaborators is prohibited!'
+
+# Users/Groups that should be cc'ed on the issue. Should be users/groups separated by a space.
+# ccList: '@user123 @user456'
+
+# Collaborators to exclude in detection. Should be a List of Strings.
+# excludeCollaborators: ['user1', 'user2']
+```
+
+When setting up this Probot App you can also set a number of Environment Variables
+
+Possible Environment Variables:
+
+- FILE_NAME [default: '.github/remove-outside-collaborators.yml'] - Sets the location/file name of the config yml file
+- ORG_WIDE_REPO_NAME [default: 'org-settings'] - Set the repo where to find the config yml file