Added Messenger plugin.

plugins/redmine_messenger/config/settings.yml

@@ -0,0 +1,26 @@
+---
+
+messenger_url: ''
+messenger_icon: 'https://raw.githubusercontent.com/alphanodes/redmine_messenger/master/assets/images/icon.png'
+messenger_channel: 'redmine'
+messenger_username: 'robot'
+messenger_verify_ssl: 1
+messenger_direct_users_messages: 0
+auto_mentions: 0
+default_mentions: ''
+display_watchers: 0
+post_updates: 1
+new_include_description: 1
+updated_include_description: 1
+post_private_contacts: 0
+post_private_db: 0
+post_private_issues: 0
+post_private_notes: 0
+post_wiki: 0
+post_wiki_updates: 0
+post_db: 0
+post_db_updates: 0
+post_contact: 0
+post_contact_updates: 0
+post_password: 0
+post_password_updates: 0