git: openjdk/skara: Add merge bot

[duke]

Changeset: 910b2c8c
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2019-08-29 10:28:43 +0000
URL:       https://github.com/openjdk/skara/commit/910b2c8c

Add merge bot

Reviewed-by: rwestberg

+ bots/merge/build.gradle
+ bots/merge/src/main/java/module-info.java
+ bots/merge/src/main/java/org/openjdk/skara/bots/merge/MergeBot.java
+ bots/merge/src/main/java/org/openjdk/skara/bots/merge/MergeBotFactory.java
+ bots/merge/src/test/java/org/openjdk/skara/bots/merge/MergeBotTests.java
! settings.gradle