add screenshots, update readme

.dockerignore

@@ -2,3 +2,5 @@ dist/
 db.sqlite
 build/
 .git
+.DS_Store
+screenshots/

.gitignore

@@ -1,3 +1,4 @@
 dist/
 db.sqlite
 build/
+.DS_Store

README.md

@@ -1,13 +1,23 @@
 # tvid
 
-This is an app that lets you set all the kiosk/display TVs in your
-organization to the same URL.  Each will be cookied with a unique ID that
-will display on each display in big letters, with no preconfiguration
-required.
+## Problem
 
-Log in to the admin panel and enter the URL for that TV ID, and within 60
-seconds, that display will bounce to that URL, or any other time it turns
-on.
+You want to deploy a bunch of cheap $150 giant TVs to display dashboards and
+status stuff, but you don't want to image the Raspberry Pis separately or
+hook up keyboards/mouse.
+
+## Solution
+
+Make a single OS image for all your display-driving SBCs that goes to a
+non-unique URL: this app.
+
+This app lets you set all the kiosk/display TVs in your organization to the
+same URL.  Each will be cookied with a unique ID that will display on each
+display in big letters, with no preconfiguration required.
+
+Log in to the admin panel (`/admin`) and enter the URL target for that
+display, and within 60 seconds, that display will bounce to that URL, or any
+other time it turns on.
 
 You can reconfigure the target URL at any time, and the next time that
 display reboots or reloads (you should be rebooting your displays daily) it
@@ -29,6 +39,25 @@ will get redirected to the new target.
 * fix FIXMEs
 * fix logging output
 * put git short id into version string
+* make sure cookie expiration is correct
+* sessions maybe
+* configuration in db to support password changes
+
+# screenshots
+
+## Display ID screen
+
+(This is what gets displayed on a TV.  It animates to avoid screenburn.)
+
+![screenshot one](/sneak/tvid/raw/branch/master/screenshots/1.png)
+
+## Login Page
+
+![screenshot two](/sneak/tvid/raw/branch/master/screenshots/2.png)
+
+## Admin Panel
+
+![screenshot three](/sneak/tvid/raw/branch/master/screenshots/3.png)
 
 # license