Add image and metadata (#4345)

Unfortunately i accidentally orphaned my other PR

model_cards/ViktorAlm/electra-base-norwegian-uncased-discriminator/README.md

+---
+language: norwegian
+thumbnail: https://i.imgur.com/QqSEC5I.png
+---
+
 # Norwegian Electra
-Image incoming, im going to have som fun with this one.
+![Image of norwegian electra](https://i.imgur.com/QqSEC5I.png)
 
 Trained on Oscar + wikipedia + opensubtitles + some other data I had with the awesome power of TPUs(V3-8)
 
 Use with caution. I have no downstream tasks in Norwegian to test on so I have no idea of its performance yet.
-
+# Model
+## Electra: Pre-training Text Encoders as Discriminators Rather Than Generators
+Kevin Clark and Minh-Thang Luong and Quoc V. Le and Christopher D. Manning
+- https://openreview.net/pdf?id=r1xMH1BtvB
+- https://github.com/google-research/electra
 # Acknowledgments
-
 ### TensorFlow Research Cloud
 Research supported with Cloud TPUs from Google's TensorFlow Research Cloud (TFRC). Thanks for providing access to the TFRC ❤️
 - https://www.tensorflow.org/tfrc
-
 #### OSCAR corpus
 - https://oscar-corpus.com/
-
 #### OPUS
 - http://opus.nlpl.eu/
 - http://www.opensubtitles.org/