Documented the API and added some help for the config file

paperless.conf.example

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+# Sample paperless.conf
+# Copy this file to /etc/paperless.conf and modify it to suit your needs.
+
+# This where your documents should go to be consumed.  Make sure that it exists
+# and that the user running the paperless service can read/write its contents
+# before you start Paperless.
+PAPERLESS_CONSUMPTION_DIR=""
+
+# These values are required if you want paperless to check a particular email
+# box every 10 minutes and attempt to consume documents from there.  If you
+# dont define a HOST, mail checking will just be disabled.
+PAPERLESS_CONSUME_MAIL_HOST=""
+PAPERLESS_CONSUME_MAIL_PORT=""
+PAPERLESS_CONSUME_MAIL_USER=""
+PAPERLESS_CONSUME_MAIL_PASS=""
+
+# You must have a passphrase in order for Paperless to work at all.  If you set
+# this to "", GNUGPG will "encrypt" your PDF by writing it out as a zero-byte
+# file.
+# The passphrase you use here will be used when storing your documents in
+# Paperless, but you can always export them in an unencrypted format by using
+# document exporter.  See the documentaiton for more information.
+#
+# One final note about the passphrase.  Once you've consumed a document with
+# one passphrase, DON'T CHANGE IT.  Paperless assumes this to be a constant and
+# can't properly export documents that were encrypted with an old passphrase if
+# you've since changed it to a new one.
+PAPERLESS_PASSPHRASE="secret"
+
+# If you intend to consume documents either via HTTP POST or by email, you must
+# have a shared secret here.
+PAPERLESS_SHARED_SECRET=""