added password explanation text

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>org.example</groupId>
     <artifactId>Widerhall</artifactId>
-    <version>0.2.32</version>
+    <version>0.2.33</version>
     <build>
         <plugins>
             <plugin>

static/templates/subscribe.st

@@ -29,6 +29,14 @@
                 </label>
                 <button type="submit">Subscribe</button>
             </fieldset>
+            <fieldset>
+                <legend>Password or not?</legend>
+                <h3>pro password</h3>
+                You will need a password, if you don`t want anybody except you to un-subscribe you from the list.
+                Also, if you are about to receive a promotion to a list moderator, you will need a password.
+                <h3>contra password</h3>
+                If you won't get a promotion, and just don't want to remember another password, don`t set one.
+            </fieldset>
         </form>
     </body>
 </html>