Reproduce NER experiments & add model description

[andreaskuster]

Experiment	Train data	Test data	F1 Score	Avg	F1 Score from the paper	Avg from the paper
1.1	Cased	Cased			92.45	-
1.2	Cased	Uncased			34.46	63.46
2	Uncased	Uncased			89.32	89.32
3.1	Augment	Cased			91.67	-
3.2	Augment	Uncased			89.31	90.49
3.5.1	Half Mixed	Cased			91.68	-
3.5.2	Half Mixed	Uncased			89.05	90.37
4	Cased	Truecase			82.93	82.93
5	Truecase	Truecase			90.25	90.25