added missing file

docker-compose.example.env

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+# The UID and GID of the user used to run paperless in the container. Set this
+# to your UID and GID on the host so that you have write access to the
+# consumption directory.
+#USERMAP_UID=1000
+#USERMAP_GID=1000
+
+# Additional languages to install for text recognition, separated by a
+# whitespace. Note that this is
+# different from PAPERLESS_OCR_LANGUAGE (default=eng), which defines the
+# default language used when guessing the language from the OCR output.
+# The container installs English, German, Italian, Spanish and French by
+# default.
+# See https://packages.debian.org/search?keywords=tesseract-ocr-&searchon=names&suite=buster
+# for available languages.
+#PAPERLESS_OCR_LANGUAGES=tur ces
+
+###############################################################################
+# Paperless-specific settings                                                 #
+###############################################################################
+
+# All settings defined in the paperless.conf.example can be used here. The
+# Docker setup does not use the configuration file.
+# A few commonly adjusted settings are provided below.
+
+# Adjust this key if you plan to make paperless available publicly. It should
+# be a very long sequence of random characters. You don't need to remember it.
+#PAPERLESS_SECRET_KEY=change-me
+
+# Use this variable to set a timezone for the Paperless Docker containers. If not specified, defaults to UTC.
+#PAPERLESS_TIME_ZONE=America/Los_Angeles
+
+# The default language to use for OCR. Set this to the language most of your
+# documents are written in.
+#PAPERLESS_OCR_LANGUAGE=eng