Adding `safetensors` variant of this model (#1)

readme: fix model name

readme: fix minor typo

readme: give nice overview about ConvBERT model

readme: add initial version with some metadata

model: add new ConvBERT model for Historic German, trained on Europeana data (TensorFlow model)

model: add new ConvBERT model for Historic German, trained on Europeana data

tokenizer: add configuration and vocab for ConvBERT model

config: add initial configuration for ConvBERT model

initial commit