feat: support running the game from jar file

build.gradle.kts

@@ -14,6 +14,11 @@ dependencies {
     testImplementation("org.junit.jupiter:junit-jupiter")
 }
 
+tasks.jar {
+    manifest.attributes["Main-Class"] = "eu.midnightdust.yaytris.Tetris"
+}
+
+
 tasks.test {
     useJUnitPlatform()
 }