Readme: show how to receive KWIC snippets from corpusQuery

Change-Id: I10df13dc471f03c8d9f8d3ef855742994ddf7083
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 https://user-images.githubusercontent.com/11092081/142769056-b389649b-eac4-435f-ac6d-1715474a5605.mp4
 
+In order to use the access token for plain corpus queries, i.e. to make `corpusQuery` return KWIC snippets, the `metadataOnly` parameter must be set to `FALSE`, for instance:
+
+```R
+new("KorAPConnection") %>% corpusQuery("Ameisenplage", metadataOnly = FALSE) %>% fetchAll()
+```
+
 ## Demos
 
 More elaborate R scripts demonstrating the use of the package can be found in the [demo](demo) folder.