Add modelcard with acknowledgements (#4321)

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

+# Norwegian Electra
+Image incoming, im going to have som fun with this one.
+
+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.
+
+# 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/