Update README.md

Author: harlev

README.md

@@ -23,15 +23,21 @@ result = jb.write(data, MY_BOX_ID)
 # get record id of written data
 record_id = jb.get_record_id(result)
 
-# read data
+# read record
 print(jb.read(MY_BOX_ID, record_id))
 
+# read all records in box
+print(jb.read(MY_BOX_ID))
+
 # update data
 data = {"name": "Bob"}
 jb.update(data, MY_BOX_ID, record_id)
 
-# read data
+# read updated data
 print(jb.read(MY_BOX_ID, record_id))
+
+# delete record
+jb.delete(MY_BOX_ID, record_id)
 ```