docs: add a changelog

Lists the unreleased changes since 1.0.4, grouped the way the TRX
changelog groups them.

CHANGELOG.md

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+# Changelog
+
+## [Unreleased](https://github.com/rr-/pq-cli/compare/1.0.4...main) - ××××-××-××
+
+**Gameplay**
+- Changed the game mechanics to match the current web version of Progress Quest, which pqcli now plays exactly like, random rolls included (#21):
+  - Changed the time needed to level up to grow exponentially: levels come much faster early on and much slower past level 49
+  - Changed quests to be much shorter
+  - Changed stat gains that favor the best stat to only consider the six prime stats
+  - Changed item rewards on inventories past 250 kinds of items to sometimes add one more of something already carried
+  - Changed impressive characters in cinematics to be named in the new styles, such as "the Queen of the Half Halflings"
+  - Changed the cinematic texts to match the web version
+  - Changed acts to begin as their loading task starts
+  - Added the Chancellor, Baroness and Inquistor titles
+- Changed the random number generator to the one the web version uses, stored with each character; existing characters get a new one on first load
+- Changed roman numerals past 4000 to use the web version's T and A numerals
+- Fixed the plot bar staying empty during the Prologue
+- Fixed the quest log keeping 101 quests instead of 100
+- Fixed "an" not being used before words starting with Ü
+
+**Customization**
+- Added data files for all word lists (monsters, spells, equipment, races, classes, titles and more), which can be replaced in `$XDG_CONFIG_HOME/pqcli/data/` or a directory given with `--data-dir` (#3)
+- Added customizable combat descriptions (`combat_verbs.json`), which say "Executing" by default (#3)
+- Added `--dump-data DIR` to copy the built-in word lists out for editing (#3)
+
+**Saves**
+- Added importing and exporting characters as `.pqw` files, the format of the web version, from both interfaces and with `--import-save` and `--export-save` (#21)
+
+**Installation**
+- Added a `Dockerfile` and `docker-compose.yml` to run the game in a container, with saves kept in a persistent volume
+- Added character creation on first run when there are no saved characters yet
+
+**Development**
+- Added tests, including gameplay traces and a comparison with the web version's own code (`just test`)
+- Added a `justfile`
+- Changed the hooks to prek, with ruff in place of black and isort, ty for type checking, and a 50/72 commit message check
+- Removed `poetry.lock`