Add matrix-welcome-back-bot

Signed-off-by: Travis Ralston <travpc@gmail.com>

supporting-docs/projects/2017-09-15-matrix-welcome-back-bot.md

@@ -0,0 +1,14 @@
+---
+layout: project
+title: matrix-welcome-back-bot
+categories: projects other
+description: A silly bot that welcomes people back to the conversation
+author: Travis Ralston
+maturity: Released
+---
+
+# {{ page.title }}
+
+[@welcomeback:t2bot.io](https://matrix.to/#/@welcomeback:t2bot.io) is a silly bot that welcomes people back to the conversation after they've been inactive for a period of time. Welcome Back Bot also demonstrates basic functionality of the js-sdk, spawned from [#offtopic:matrix.org](https://matrix.to/#/#offtopic:matrix.org).
+
+The source (and more information) can be found on [GitHub](https://github.com/turt2live/matrix-welcome-back-bot).