Update README.md

README.md

@@ -17,14 +17,23 @@ The mandatory template.json file's structure is the following.
  - "fields" - array of used variables by service
 
 An element of fields can contain the following keys.
- - description
- - key
- - value 
- - required
- - type
- - generated
+ - description - label of the field, this text will appear before element 
+ - key - name of variable
+ - value - default value of variable in the form
+ - required - if set "true" then fill in of the field is required in the form
+ - type - if not set then default is text, available field types: text, password, textarea, select 
+        - if type is "select" then options are separated by ",". Option's value and text is separated by ":", but text is not mandatory. For example:
+
+        "value": "yes,no"
+        "value": "1:gmail,2:microsoft outlook/hotmail,3:other",
+
+ - generated - the value of the variable is auto generated, so the field will not appear in the form. Generated examples:
+
+        "time|md5|8" - generated from time, encoded by md5 and character length is 8
+        "random|md5|20" - random generated number, encoded by sha256, length is 20
+
+Field element example:
 
-For example:
         {
                 "description": "Please add Nextcloud password:",
                 "key": "NEXTCLOUD_PASSWORD",