update readme

README.md

@@ -70,6 +70,16 @@ editioncrafter process -i <tei_file> -o <output_path> -u <base_url>
 ```
 This will create all of the artifacts that EditionCrafter needs in order to display your document on the web, and place them in the specified `<output_path>` folder. The `<base_url>` parameter should be the URL at which you intend to host these artifacts.
 
+### `database`
+
+Process the TEI document into a SQLite file containing a directory of categories and tags. This can be used with the Record List component from the EditionCrafter viewer package, or it can be browsed directly with a SQLite viewer.
+
+Usage: `editioncrafter database [-i tei_file] [-o output_path]`
+
+Required parameters:
+* -i tei_file
+* -o output_path (must end in .sqlite)
+
 ## Command line options
 
 ### `-c` or `--config`