Initial commit: Star of Words Unity project

Snapshot of the existing Unity 6 language-learning word game before any
refactoring. Adds Unity .gitignore and .gitattributes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,58 @@
+# ===== Unity generated / regenerable =====
+[Ll]ibrary/
+[Tt]emp/
+[Oo]bj/
+[Bb]uild/
+[Bb]uilds/
+[Ll]ogs/
+[Uu]ser[Ss]ettings/
+[Mm]emoryCaptures/
+[Rr]ecordings/
+
+# Asset meta data should only be ignored when the corresponding asset is also ignored
+!/[Aa]ssets/**/*.meta
+
+# Unity3D generated meta files
+*.pidb.meta
+*.pdb.meta
+*.mdb.meta
+
+# Unity3D generated file on crash reports
+sysinfo.txt
+
+# ===== Visual Studio / Rider / IDE =====
+.vs/
+.vsconfig
+.idea/
+ExportedObj/
+.consulo/
+*.csproj
+*.unityproj
+*.sln
+*.slnx
+*.suo
+*.tmp
+*.user
+*.userprefs
+*.pidb
+*.booproj
+*.svd
+*.pdb
+*.mdb
+*.opendb
+*.VC.db
+
+# Crashlytics generated file
+crashlytics-build.properties
+
+# Rider
+/.idea/
+/Assembly-CSharp.csproj
+
+# ===== OS junk =====
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# ===== Misc project cruft seen in this repo =====
+.utmp/