update README

README.md

@@ -1,6 +1,22 @@
+This application allows you to upload photos, where are then automatically
+scaled down, using python3-pillow, and saved into an adjacent directory
+which is served from a different subdomain.
+
+There is also dashboard functionality, showing you information about the photos
+such as size-on-disc, and exif data such as gps coordinates.
+
+## features
+* upload, download, delete, photos
+* automatically scales down photos
+* 2fa with authenticator app
+* XMPP error logging
+* separate static subdomain for hosting the photos
+* dashboard with photo stats
+
 ## deploy
 
-works on Debian 10 using only distro python3 packages
+works on Debian 10 using only distro python3 packages, examples for
+deployment in the examples directory
 
 ## apache configs
 
@@ -14,8 +30,8 @@ outside of the flask app
 
 ## dns
 
-login to your dns provider and add A and AAAA records for photo_app.example.com
-and add A and AAA records for photos.example.com
+login to your dns provider and add A and AAAA records for **photo_app.example.com**
+and add A and AAAA records for **photos.example.com**
 
 or for LAN testing or deployment, if you are running dnsmasq on your router, you
 can add something like the following to the `/etc/hosts` file, and then restart
@@ -28,3 +44,10 @@ dnsmasq
 ## email white list
 in order to register, login to the psql command line and insert
 your email address into the email_white_list table
+
+## error logging
+The configured logging handler in `__init__.py` requires setting up some
+xmpp accounts, i.e. setting up an Prosody server.
+
+If this isn't possible, you could use a different logging handler,
+such as SMTPHandler, or just look in the systemd-journal.