Create matrix-appservice-email project page

supporting-docs/projects/2017-05-24-matrix-appservice-email.md

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+---
+layout: project
+title: Matrix E-mail Bridge
+categories: projects as
+description: Two ways from/to E-mail bridge
+author: Kamax.io, sponsored by Open-Xchange
+maturity: Alpha
+---
+
+# {{ page.title }}
+An application service gateway for bridging between E-mail and Matrix, written using Spring Boot (Java) using [matrix-java-sdk](https://github.com/kamax-io/matrix-java-sdk).  
+You can get the [code on github](https://github.com/kamax-io/matrix-appservice-email).
+
+Features:
+- Matrix to E-mail forwarding
+- E-mail to Matrix forwarding
+- E-mail <-> Matrix <-> E-mail forwarding, if several bridge users are present within a room
+- Fully configuration notification templates, per event
+- Subscription portal where E-mail users can manage their notifications