add description and screenshot

doc/DESCRIPTION.md

@@ -1 +1,23 @@
-description.md: This is a dummy description of this app features
+My Idlers is a useful register for keeping track of your servers and online hosting accounts. 
+It is a single-user app; if more than one person wants to use this functionality, it needs to be installed multiple times. 
+Besides that, for now, it needs a (sub)domain for itself. 
+
+This is my first app packaging attempt; there may be some rough edges. 
+
+What works: 
+* installing the app and using its features
+* uninstalling 
+
+What does not (yet?) work:
+* moving the app to another domain
+* installing the app in subfolder
+* LDAP integration
+
+What I intend to work on enabling: 
+* create your account from this install page, instead of manually in the app on first use. Once that is done, I will change the default group from "all_users" to "visitors"
+* moving app to another domain 
+* installing to subdirectory
+
+
+
+![Screenshot of My Idlers](./doc/screenshots/my_idlers.jpg)