refactor: updated folder structure

backend/sprik-backend/build.gradle.kts

@@ -0,0 +1,27 @@
+plugins {
+    kotlin("jvm") version "1.8.21"
+    application
+}
+
+group = "org.example"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(kotlin("test"))
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+kotlin {
+    jvmToolchain(11)
+}
+
+application {
+    mainClass.set("MainKt")
+}