Add mergeable

mergeable.md

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+---
+# A human-friendly name of your listing
+title: Mergeable
+# A short description of what your app does
+description: A GitHub App that prevents merging of pull requests based on [configurations](https://github.com/jusx/mergeable#configuration).
+# The slug of your hosted app on GitHub (https://github.com/apps/YOUR-SLUG)
+slug: mergeable
+# Include a few screenshots that show your app in action
+screenshots:
+- https://raw.githubusercontent.com/jusx/mergeable/5d9c9cab357b12b84af62044ac46648d9fca84c4/screenshot.gif
+# The GitHub usernames of anyone who authored the app
+authors: [ jusx ]
+# The repository where the code is located
+repository: jusx/mergeable
+# The address where this app is deployed
+host: http://mergeable-bot.herokuapp.com/
+---
+
+A GitHub App that prevents merging of pull requests based on [configurations](https://github.com/jusx/mergeable#configuration). Make your pull requests mergeable only when:
+
+- Certain terms are not in the **title** or **label**.
+
+- The **milestone** on the pull request matches with what is configured.
+
+- There are at least `n` number of **approved reviews**, where `n` is configurable.
+