added README

README.txt

@@ -0,0 +1,16 @@
+gphotos-cdp
+========
+
+This program uses the Chrome DevTools Protocol to drive a Chrome session that
+downloads your photos stored in Google Photos.
+By default, it starts at the most ancient item in the library, and progresses
+towards the most recent.
+It can be run incrementally, as it keeps track of the last item that was
+downloaded.
+It only works with the main library for now, i.e. it does not support the photos
+moved to Archive, or albums.
+For each downloaded photo, an external program can be run on it (with the -run
+flag) right after it is downloaded to e.g. upload it somewhere else. See the
+upload/perkeep program, which uploads to a Perkeep server, for an example.
+
+

main.go

@@ -1,3 +1,5 @@
+// This program uses the Chrome DevTools Protocol to drive a Chrome session that
+// downloads your photos stored in Google Photos.
 package main
 
 import (