Initial commit: Kotlin Multiplatform project setup

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

.gitignore

@@ -0,0 +1,19 @@
+*.iml
+.kotlin
+.gradle
+**/build/
+xcuserdata
+!src/**/build/
+local.properties
+.idea
+.DS_Store
+captures
+.externalNativeBuild
+.cxx
+*.xcodeproj/*
+!*.xcodeproj/project.pbxproj
+!*.xcodeproj/xcshareddata/
+!*.xcodeproj/project.xcworkspace/
+!*.xcworkspace/contents.xcworkspacedata
+**/xcshareddata/WorkspaceSettings.xcsettings
+node_modules/