End of support announcement (#2595)

Author: vince62s

README.md

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+# Announcement: OpenNMT-py is no longer actively supported.
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+We started a new project [Eole](https://eole-nlp.github.io/eole/) available on [Github](https://github.com/eole-nlp/eole)
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+It is a spin-off of OpenNMT-py in termes of features but we revamped a lot of stuff.
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+Eole handles NMT, LLM, Encoders as well as a new concept of Estimator within a NMT Model See this [post](https://medium.com/p/05b00b271a47) and this [news](https://www.linkedin.com/posts/vincentnguyenngoc_embarrassingly-small-english-to-german-model-activity-7203400634727841792-FCre?utm_source=share&utm_medium=member_desktop)
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+If you are a developer, switch now. If you are a user only, then we will publish the first py-pi versions shortly.
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+
 # OpenNMT-py: Open-Source Neural Machine Translation and (Large) Language Models
 
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