Adding top-level readme.

Author: mszym1

README.md

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+# dolby-encoding-engine
+
+This repository contains various additions to Dolby Encoding Engine (DEE), such as plugins allowing integration of 3rd part components.
+
+:mega: If you need stable source code, use [release archives](https://github.com/DolbyLaboratories/dolby-encoding-engine/releases) to get components associated with specific DEE version.
+
+Master branch is updated outside of DEE release schedule.
+It may happen, that master branch is ahead of DEE release and contains compatibility-breaking changes. In that case, published components cannot be used with latest, public DEE release.