Update docs.

README.md

@@ -2,6 +2,7 @@
 
 ## Pre-requisites
 
+* a passing familiarity with the command line
 * youtube-dl (plus any of its required dependencies, like ffmpeg)
 * golang compiler
 
@@ -9,9 +10,13 @@
 
     go build
 
+## Binaries
+
+TBD
+
 ## Running
 
-    ./gropple -port 8000 -address http://hostname:8000 -path /downloads
+    gropple -port 8000 -address http://hostname:8000 -path /downloads
 
 With no arguments, it will listen on port 8000 and use an address of 'http://localhost:8000'.
 
@@ -21,4 +26,24 @@ a different address if you are running it behind a proxy server or similar.
 
 ## Using
 
+Bring up `http://localhost:8000` (or your chosen address) in your browser. You should see a link to the bookmarklet at the top of the screen, and the list of downloads (currently empty).
+
+Drag the bookmarklet to your favourites bar, or otherwise bookmark it as you see fit.
+
+Whenever you are on a page with a video you would like to download, simply click the bookmarklet.
+
+A popup window will appear, the download will start on the your gropple server and the status will be shown in the window.
+
+You may close this window at any time without stopping the download, the status of all downloads is available on the index page.
+
+## TODO
+
+Many things. Please raise an issue.  Known items:
+
+* queue downloads if too many started (maybe by domain)
+* show logs from the index page
+* process logs better to note post-processing (for instance when video and audio are downloaded separately and then combined)
+* configurable options for youtube-dl, or the ability to use various youtube-dl forks
+
+