Migrate model card from transformers-repo

Read announcement at https://discuss.huggingface.co/t/announcement-all-model-cards-will-be-migrated-to-hf-co-model-repos/2755
Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/kiri-ai/distiluse-base-multilingual-cased-et/README.md

README.md

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+---
+language: et
+---
+## Model Description
+
+This model is based off **Sentence-Transformer's** `distiluse-base-multilingual-cased` multilingual model that has been extended to understand sentence embeddings in Estonian.
+
+## Sentence-Transformers
+
+This model can be imported directly via the SentenceTransformers package as shown below:
+
+```python
+from sentence_transformers import SentenceTransformer
+model = SentenceTransformer('kiri-ai/distiluse-base-multilingual-cased-et')
+sentences = ['Here is a sample sentence','Another sample sentence']
+embeddings = model.encode(sentences)
+
+print("Sentence embeddings:")
+print(embeddings)
+```
+
+## Fine-tuning
+
+The fine-tuning and training processes were inspired by [sbert's](https://www.sbert.net/) multilingual training techniques which are available [here](https://www.sbert.net/examples/training/multilingual/README.html). The documentation shows and explains the step-by-step process of using parallel sentences to train models in a different language.
+
+### Resources
+
+The model was fine-tuned on English-Estonian parallel sentences taken from [OPUS](http://opus.nlpl.eu/) and [ParaCrawl](https://paracrawl.eu/).