add tutorial

README.md

@@ -24,3 +24,17 @@ Known languages:
 	ko Korean (한국어)
 	pt Portuguese (Português)
 	zh Chinese (中文)
+
+# Usage
+
+This example shows how to translate to Spanish.
+
+1. Create a folder to hold the configuration and database files.
+   The commands must to be run from inside this folder.
+2. Put `config.json` and `cards.cdb` (the English database) inside the folder.
+3. Copy `cards.cdb` to `cards-es.cdb`.
+   The "-es" sulfix is the language code.
+4. Run the command `wikia -update -lang es`.
+   This will download the Wikia database.
+5. Run the command `wikia -translate -lang es`.
+