adds more up to date documentation

README.md

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 # Hamburg.jl
 
 A little package that makes various information about Hamburg, Germany available in an easily accessible fashion.
+
+## Usage
+
+```julia
+using Hamburg
+datasets(topic, dataset)
+```
+
+## Topics
+
+### covid-19
+
+Source: [hamburg.de](https://www.hamburg.de/corona-zahlen)
+
+#### datasets
+
+**infected**: Number of people infected by covid-19, recorded since July 27, 2020
+
+`datasets("covid-19", "infected")`
+
+**boroughs**: The number infected, by borough.
+
+These are aggregated numbers, representing the cases for the last 14 days. This is so that the privacy of individuals can be guaranteed.
+
+`datasets("covid-19", "boroughs")`