Add Reaction Comments app

_apps/reaction.md

@@ -0,0 +1,64 @@
+---
+title: Reaction Comments
+description: Deletes +1 comments and educates users about GitHub reactions.
+slug: reaction
+screenshots:
+- https://raw.githubusercontent.com/dessant/reaction-comments/master/assets/screenshot.png
+authors:
+- dessant
+repository: dessant/reaction-comments
+host: https://probot-reaction-comments.glitch.me
+---
+
+A GitHub App that educates users about the correct use of GitHub reactions,
+and deletes new reaction comments, such as +1.
+
+## How It Works
+
+The app detects if a new comment consists solely of emojis and shortcodes
+used in GitHub reactions. A matching comment is either replaced
+with the message set in `reactionComment` and deleted after a day,
+or it is deleted immediately, if `reactionComment` is set to `false`.
+
+## Usage
+
+1. **[Install the GitHub App](https://github.com/apps/reaction)**
+2. Create `.github/reaction.yml` based on the template below
+
+#### Configuration
+
+Create `.github/reaction.yml` in the default branch to enable the app.
+The file can be empty, or it can override any of these default settings:
+
+```yaml
+# Configuration for reaction-comments - https://github.com/dessant/reaction-comments
+
+# Issues and pull requests with these labels accept reaction comments.
+# Set to `[]` to disable
+exemptLabels: []
+
+# Replace matching comments with this message, `{user}` is a placeholder
+# for the comment author. Set to `false` to disable
+reactionComment: >
+  :wave: @{user}, did you mean to use a [reaction](https://git.io/vhzhC) instead?
+
+# Limit to only `issues` or `pulls`
+# only: issues
+
+# Optionally, specify configuration settings just for `issues` or `pulls`
+# issues:
+#   exemptLabels:
+#     - party-parrot
+
+# pulls:
+#   reactionComment: false
+
+# Repository to extend settings from
+# _extends: repo
+```
+
+## Supporting the Project
+
+The continued development of Reaction Comments is made possible thanks
+to the support of awesome backers. If you'd like to join them, please consider
+contributing with [Patreon](https://www.patreon.com/dessant).