Insert spotless plugin

.editorconfig

@@ -0,0 +1,6 @@
+[*.{kt,kts}]
+indent_size = 4
+continuation_indent_size = 4
+insert_final_newline = true
+max_line_length = 120
+disabled_rules = no-wildcard-imports,experimental:argument-list-wrapping

build.gradle.kts

@@ -2,6 +2,7 @@
 plugins {
     alias(libs.plugins.kotlin.jvm)
     alias(libs.plugins.ktor)
+    id("com.diffplug.spotless") version "7.0.3"
 }
 
 group = "com.es"
@@ -33,3 +34,10 @@ dependencies {
     testImplementation(libs.ktor.server.test.host)
     testImplementation(libs.kotlin.test.junit)
 }
+
+spotless {
+    kotlin {
+        ktlint("3.1.1")
+        target("**/*.kt")
+    }
+}