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>

Assets/Plugins/Android/settingsTemplate.gradle.DISABLED

@@ -0,0 +1,29 @@
+pluginManagement {
+    repositories {
+        **ARTIFACTORYREPOSITORY**
+        gradlePluginPortal()
+        google()
+        mavenCentral()
+    }
+}
+
+include ':launcher', ':unityLibrary'
+**INCLUDES**
+
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.PREFER_SETTINGS)
+    repositories {
+        **ARTIFACTORYREPOSITORY**
+        google()
+        mavenCentral()
+// Android Resolver Repos Start
+        maven {
+            url "https://maven.google.com/" // Assets/GoogleMobileAds/Editor/GoogleMobileAdsDependencies.xml:7, Assets/GoogleMobileAds/Editor/GoogleMobileAdsDependencies.xml:12, Assets/GoogleMobileAds/Editor/GoogleMobileAdsDependencies.xml:17, Assets/GoogleMobileAds/Editor/GoogleUmpDependencies.xml:7
+        }
+        mavenLocal()
+// Android Resolver Repos End
+        flatDir {
+            dirs "${project(':unityLibrary').projectDir}/libs"
+        }
+    }
+}