title: Barplot from Sums of Columns in Data Frame
body: <p>I have a data frame with 190 observations (rows). There are five columns, in which every entry either has the value 0 or 1.<br>
  How do I get a barplot that has the name of the five columns on the x-Axis and the number of 1's (i.e. the sum) of every column as height of the bars - preferably with ggplot?<br>
  I'm sorry I don't have any sample data, I couldn't figure out how to produce a smaller dataframe that fits the descriptions. </p>