dotenv: add sample .env file.

.env

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+# The settings here, if defined, override the settings in config/database.yml,
+# config/unicorn/unicorn.rb, config/danbooru_local_config.rb, and
+# ~/.danbooru/{secret_token,session_secret_key}.
+#
+# `.env.$RAILS_ENV` takes precedence over .env, and .env.local takes
+# precedence over .env and `.env.$RAILS_ENV`.
+#
+# In other words: put your shared config in .env.local, and your put
+# environment-specific config in .env.development / .env.production / .env.test.
+
+#
+# Unicorn
+#
+
+# These settings only take effect when running with `bundle exec unicorn -c config/unicorn/unicorn.rb`.
+
+# export UNICORN_ROOT="$(pwd)"
+# export UNICORN_LISTEN=127.0.0.1:9000
+# export UNICORN_PROCESSES=1
+# export UNICORN_TIMEOUT=90
+# export UNICORN_LOG="log/unicorn-${UNICORN_LISTEN}.log"
+# export UNICORN_PIDFILE="$UNICORN_ROOT/tmp/pids/unicorn-${UNICORN_LISTEN}.pid"
+
+# These only take effect if you're running unicorn as root in order to bind to
+# port 80 and need to drop privileges. Reverse proxying behind nginx is a better idea.
+# export UNICORN_USER=danbooru
+# export UNICORN_GROUP=danbooru
+
+#
+# Database
+#
+
+# DATABASE_URL takes precedence over config/database.yml if defined.
+
+# Put these in .env.production or .env.development to define your dev/prod
+# databases. Do not define it in .env or .env.local! It will be taken as your
+# test database too, and rails will wipe it if you run the test suite.
+# export DATABASE_URL="postgresql://localhost/danbooru2"
+# export ARCHIVE_DATABASE_URL="postgresql://localhost/archive_development"
+# export RO_DATABASE_URL="$DATABASE_URL"
+
+# Put these in .env.test to define your test database.
+# export DATABASE_URL="postgresql://localhost/danbooru2_test"
+# export RO_DATABASE_URL="postgresql://localhost/danbooru2_test"
+# export ARCHIVE_DATABASE_URL="postgresql://localhost/danbooru2_archive_test"
+
+#
+# Rails
+#
+
+# These take precedence over ~/.danbooru/{secret_token,session_secret_key}.
+# export SECRET_TOKEN=
+# export SESSION_SECRET_KEY=
+
+# Override the normal Gemfile with another file.
+# export BUNDLE_GEMFILE=
+
+# Logs a stacktrace for each SQL query.
+# export QUERY_TRACE=
+
+#
+# Danbooru
+#
+
+# These take precedence over config/danbooru_local_config.rb. Any setting in
+# danbooru_default_config.rb can be defined here by prefixing it with `DANBOORU_`.
+
+# export DANBOORU_APP_NAME=
+# export DANBOORU_VERSION=
+# export DANBOORU_HOSTNAME=
+# export DANBOORU_PIXIV_LOGIN=
+# export DANBOORU_PIXIV_PASSWORD=
+# export DANBOORU_TWITTER_API_KEY=
+# export DANBOORU_TWITTER_API_SECRET=
+# export DANBOORU_AWS_ACCESS_KEY_ID=
+# export DANBOORU_AWS_SECRET_ACCESS_KEY=
+# export DANBOORU_AWS_SQS_REGION=
+# export DANBOORU_IQDBS_AUTH_KEY=
+# export DANBOORU_IQDBS_SERVER=