Add jmdict data + update script

jmdict/version.txt

@@ -0,0 +1 @@
+2026-04-07

scripts/update-jmdict.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p coreutils curl gitMinimal gzip gnugrep gnused xmlformat
+
+set -euo pipefail
+set -x
+
+URL='http://ftp.edrdg.org/pub/Nihongo/JMdict_e_examp.gz'
+TMP="$(mktemp -d)"
+
+PROJECT_ROOT="$(git rev-parse --show-toplevel)"
+DATA_DIR="$PROJECT_ROOT/jmdict"
+
+function cleanup {
+  rm -rf "$TMP"
+}
+trap cleanup EXIT
+
+curl -L -o "$TMP/jmdict.gz" "$URL"
+gzip -dkc "$TMP/jmdict.gz" > "$TMP/jmdict.xml"
+xmlformat "$TMP/jmdict.xml" > "$TMP/jmdict_formatted.xml"
+mv "$TMP/jmdict_formatted.xml" "$DATA_DIR/jmdict.xml"
+
+head -n 2000 "$DATA_DIR/jmdict.xml" \
+| grep -Eo 'JMdict created: [0-9]{4}-[0-9]{2}-[0-9]{2}' \
+| sed 's/JMdict created: //g' \
+> "$DATA_DIR/version.txt"
+
+cleanup