Add missing page, #4

docs/general/preferences.rst

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+Preferences
+===========
+
+We have preferences in order to limit the number of tools with which developers need to be familiar.
+
+Collaboration
+-------------
+
+-  GitHub (issue tracking, `project board <https://docs.github.com/en/github/managing-your-work-on-github/about-project-boards>`__)
+-  Google Docs (collaborative editing)
+-  Google Meet (audio/video calling)
+-  Google Chat, WhatsApp, Signal, Slack (instant messaging)
+
+DevOps
+------
+
+-  `SaltStack <https://docs.saltstack.com/>`__ (service deployment)
+-  `Prometheus <https://prometheus.io>`__ (service monitoring)
+-  `Sentry <https://sentry.io/>`__ (error tracking)
+-  `GitHub Actions <https://docs.github.com/en/actions>`__ (automated testing)
+-  `Coveralls <https://coveralls.io/github/open-contracting>`__ (coverage reporting)
+
+Hosting
+-------
+
+-  GitHub (code)
+-  ReadTheDocs (documentation)
+-  Bytemark (virtual private servers)
+-  Hetzner (dedicated servers)
+-  AWS Simple Storage Service (S3) (storage)
+-  AWS Relational Database Service (RDS) (database)
+
+Languages
+---------
+
+-  Python (backend)
+-  JavaScript (frontend)
+-  Make (build)
+-  Bash (script)
+-  `reStructured Text <https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html>`__ (`Sphinx <https://www.sphinx-doc.org/>`__ documentation)
+-  `Markdown <https://commonmark.org>`__ (non-Sphinx documentation)
+
+Datastores
+----------
+
+-  PostgreSQL
+-  Elasticsearch if our needs exceed PostgreSQL's capabilities, or if there is no PostgreSQL database
+
+Miscellaneous
+-------------
+
+-  AWS Simple Email Service (SES) (email)
+-  RabbitMQ (message broker)
+-  Memcached (page caching)
+-  Transifex (translation)
+
+Reference
+---------
+
+-  `18F Language Selection Guide <https://engineering.18f.gov/language-selection/>`__
+-  `18F Datastore Selection Guide <https://engineering.18f.gov/datastore-selection/>`__