Add MaryTTS platform (#2397)

* Add MaryTTS platform

* Update docs

source/_components/tts.marytts.markdown

@@ -0,0 +1,48 @@
+---
+layout: page
+title: "MaryTTS"
+description: "Instructions how to setup MaryTTS with Home Assistant."
+date: 2017-04-08 16:49
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: marytts.png
+ha_category: Text-to-speech
+ha_release: 0.43
+---
+
+The `marytts` text-to-speech platform uses [MaryTTS](http://mary.dfki.de/) Text-to-Speech engine to read a text with natural sounding voices.
+
+To enable text-to-speech with MaryTTS, add the following lines to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+tts:
+  - platform: marytts
+    host: 'localhost'
+    port: 59125
+```
+
+Configuration variables:
+
+- **host** (*Optional*): MaryTTS server hostname or IP address. Default is `localhost`.
+- **port** (*Optional*): MaryTTS server port. Default is 59125.
+- **codec** (*Optional*): Audio codec. Default is `wav`. Supported are `aiff`, `au`, `wav`.
+- **voice** (*Optional*): Speaker voice. Default is `cmu-slt-hsmm`.
+- **language** (*Optional*): Language to use. Default is `en-US`. Supports 'de', 'en-GB', 'en-US', 'fr', 'it', 'lb', 'ru', 'sv', 'te', 'tr'.
+
+See [documentation](http://mary.dfki.de/documentation/index.html) for details.
+
+A full configuration sample:
+
+```yaml
+# Example configuration.yaml entry
+tts:
+  - platform: marytts
+    host: 'localhost'
+    port: 59125
+    codec: 'wav'
+    voice: 'cmu-slt-hsmm'
+    language: 'en-US'
+```