Create an App Manifest

[primetheus]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
Using an App Manifest, the creation and installation of this app would be much simpler

https://developer.github.com/apps/building-github-apps/creating-github-apps-from-a-manifest/

Describe alternatives you've considered
The existing README walks through the manual steps, which is a bit confusing

Additional context
N/A

[primetheus]

Sample:

# This is a GitHub App Manifest. These settings will be used by default when
# initially configuring your GitHub App.
#
# NOTE: changing this file will not update your GitHub App settings.
# You must visit github.com/settings/apps/your-app-name to edit them.
#
# Read more about configuring your GitHub App:
# https://probot.github.io/docs/development/#configuring-a-github-app
#
# Read more about GitHub App Manifests:
# https://developer.github.com/apps/building-github-apps/creating-github-apps-from-a-manifest/

name: Rally + GitHub
url: https://github.com/github/rally
description: An app to integrate GitHub Pull Requests with Broadcom's Rally
public: true

default_events:
 - check_run
 - check_suite
 - pull_request
 - push

default_permissions:
 # Checks on code.
 # https://developer.github.com/v3/apps/permissions/#permission-on-checks
 checks: write

 # Repository contents, commits, branches, downloads, releases, and merges.
 # https://developer.github.com/v3/apps/permissions/#permission-on-contents
 contents: read

 # Issues and related comments, assignees, labels, and milestones.
 # https://developer.github.com/v3/apps/permissions/#permission-on-issues
 issues: write

 # Search repositories, list collaborators, and access repository metadata.
 # https://developer.github.com/v3/apps/permissions/#metadata-permissions
 metadata: read

 # Pull requests and related comments, assignees, labels, milestones, and merges.
 # https://developer.github.com/v3/apps/permissions/#permission-on-pull-requests
 pull_requests: write

[github-actions]

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