fix: add gehirn build script

gehirn/build.gradle.kts

@@ -0,0 +1,30 @@
+plugins {
+    alias(libs.plugins.kotlinMultiplatform)
+
+    alias(libs.plugins.jetbrainsCompose)
+    kotlin("plugin.serialization") version "1.9.21"
+}
+
+group = "org.cec.brick"
+version = "1.0-SNAPSHOT"
+
+kotlin {
+    jvm("desktop")
+    sourceSets {
+        val desktopMain by getting
+        commonMain.dependencies {
+            implementation(compose.runtime)
+            implementation(compose.foundation)
+            implementation(compose.material3)
+            implementation(compose.ui)
+            implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.1")
+            implementation("io.insert-koin:koin-core:3.5.3")
+            implementation("io.insert-koin:koin-compose:1.1.2")
+//            implementation("io.insert-koin:koin-core-coroutines:3.5.3")
+        }
+        desktopMain.dependencies {
+            implementation(compose.desktop.currentOs)
+            implementation(project(":engine"))
+        }
+    }
+}

settings.gradle.kts

@@ -18,4 +18,4 @@ dependencyResolutionManagement {
     }
 }
 
-include(":composeApp", "engine", "gehirn")
+include(":composeApp", ":engine", ":gehirn")