Add a list of alternatives for people to try (#5691)

README.md

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-⚠️ **NOTICE:** The AllenNLP library is now in maintenance mode. That means we are no longer adding new features or upgrading dependencies. We will still respond to questions and address bugs as they arise up until December 16th, 2022.  If you have any concerns or are interested in maintaining AllenNLP going forward, please open an issue on this repository.
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-AllenNLP has been a big success for us, but as the field is advancing quickly it's time to focus on new initiatives.  Presently we're working hard to make [AI2 Tango](https://github.com/allenai/tango) the best way to organize research codebases.
+⚠️ **NOTICE:** The AllenNLP library is now in maintenance mode. That means we are no longer adding new features or upgrading dependencies. We will still respond to questions and address bugs as they arise up until December 16th, 2022. If you have any concerns or are interested in maintaining AllenNLP going forward, please open an issue on this repository.
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+AllenNLP has been a big success, but as the field is advancing quickly it's time to focus on new initiatives. We're working hard to make [AI2 Tango](https://github.com/allenai/tango) the best way to organize research codebases. If you are an active user of AllenNLP, here are some suggested alternatives:
+* If you like the trainer, the configuration language, or are simply looking for a better way to manage your experiments, check out [AI2 Tango](https://github.com/allenai/tango).
+* If you like the AllenNLP metrics package, check out [torchmetrics](https://torchmetrics.readthedocs.io/en/stable/). It has the same API as AllenNLP, so it should be a quick learning curve to make the switch.
+* If you want to vectorize text, try [the transformers library](https://github.com/huggingface/transformers).
+* If you want to maintain the AllenNLP Fairness or Interpret components, please get in touch. There is no alternative to it, so we are looking for a dedicated maintainer.
+* If you are concerned about other AllenNLP functionality, please create an issue. Maybe we can find another way to continue supporting your use case.
 
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