Add game code and PDF subcommands (#5)

* add game code subcmd

* add pdf rendering

* rustc 1.81

Author: funnyboy-roks

.github/workflows/check.yml

@@ -82,7 +82,7 @@ jobs:
     # https://docs.github.com/en/actions/learn-github-actions/contexts#context-availability
     strategy:
       matrix:
-        msrv: ["1.80"]
+        msrv: ["1.81"]
     name: ubuntu / ${{ matrix.msrv }}
     steps:
       - uses: actions/checkout@v4

.gitignore

@@ -1 +1,2 @@
 /target
+*.pdf