Update README.md

Author: unitycoder

README.md

@@ -1,2 +1,22 @@
 # UnityRuntimeTextToSpeech
-Runtime TTS plugin for unity, using espeak-ng (windows only)
+Runtime TTS plugin for unity, using [espeak-ng](https://github.com/espeak-ng/espeak-ng) & [espeak-ng-wrapper](https://github.com/parhamdoustdar/espeak-ng-wrapper) and [dll manipulator](https://github.com/MCpiroman/UnityNativeTool)
+
+Quick project scrambled together from bits and pieces, to get free, non-windows-system-voice dependent, runtime TTS for unity.
+
+## Unity version
+2018.3.13f1
+
+## Known issues
+Crashes if exit application while its speaking
+
+## Pull requests
+Are accepted, but open issue first to describe your fixes or updates
+
+### dll manipulator license
+https://github.com/mcpiroman/UnityNativeTool/blob/master/LICENSE.txt
+
+### espeak dotnet wrapper license
+https://github.com/parhamdoustdar/espeak-ng-wrapper/blob/master/LICENSE
+
+### espeak-ng license
+https://github.com/espeak-ng/espeak-ng#license-information