[kaldi] Readme (#4962)

Initiative to provide a Readme to all addon directories. Sometimes you really don't know what they are for.

Signed-off-by: davidgraeff <[email protected]>

addons/voice/org.openhab.voice.kaldi/README.md

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+# Kaldi TTS
+
+Kaldi is a speech recognition toolkit, freely available under the Apache License.
+
+Kaldi aims to provide software that is flexible and extensible.
+It supports linear transforms, MMI, boosted MMI and MCE discriminative training,
+feature-space discriminative training, and deep neural networks.
+
+Find Kaldi here: http://kaldi-asr.org/.
+The github project is: https://github.com/kaldi-asr/kaldi.