Updated input reamde with dictation manager desc

Author: Stephen Hodgson

Assets/HoloToolkit/Input/README.md

@@ -168,6 +168,16 @@ Input source for raw interactions sources information, which gives finer details
 Allows dragging an object in space with your hand on HoloLens. Just attach the script to a game object to make it movable.
 
 #### Microphone
+
+##### DictationManager.cs
+Singleton class that implements  the DictationRecognizer to convert the user's speech to text. The DictationRecognizer exposes dictation functionality and supports registering and listening for hypothesis and phrase completed events.
+
+- **DictationAudioSource** : The Dictation Audio Source. Useful for dictation playback.
+- **DictationResult** : String result of the current dictation.
+- **InitialSilenceTimeout** :  The time length in seconds before dictation recognizer session ends due to lack of audio input in case there was no audio heard in the current session.
+- **AutoSilenceTimeout** : The time length in seconds before dictation recognizer session ends due to lack of audio input.
+- **recordingTime** : Length in seconds for the manager to listen.
+
 ##### MicStream.cs
 Lets you access beam-formed microphone streams from the HoloLens to optimize voice and/or room captures, which is impossible to do with Unity's Microphone object. Takes the data and inserts it into Unity's AudioSource object for easy handling. Also lets you record indeterminate-length audio files from the Microphone to your device's Music Library, also using beam-forming.