added readme, configurable path

README.md

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+# About
+
+This is a node script extracting E-Books from Amazon Kindle Cloud Reader.
+Useful e.g. for being able to read on devices where the Clour Reader doesn't work and for having a copy in an open format.
+Works with Chrome/Chromium. Other browsers use different formats for the WebSQL file where the E-Books are stored for offline use.
+
+Code is from this gists:
+
+ * 1: https://gist.github.com/yangchenyun/a1c123935d82f5e25d57
+ * 2: https://gist.github.com/EelMood/84140e557065ac3d73f669f120429ae1
+
+I have just added minor usability improvements (e.g. cmdline switch for input file selection) and a package.json file.
+
+**TODO**
+
+This is much better then nothing, but far from perfect.
+
+* Generated files may become huge and cause troubles to some browsers. Storing images as standalone files may improve that.
+* Page numbers should probably be included (optionally?).
+* An option to extract only specific books would be useful for large libraries. Currently, it will extract all e-books found in the given file.
+* The script could support the user in finding the right sqlite file.