Switch from maven to gradle.

backend/codiki-exposition/build.gradle.kts

@@ -0,0 +1,11 @@
+plugins {
+    id("io.spring.dependency-management") version "1.1.7"
+}
+
+dependencies {
+    implementation(project(":codiki-application"))
+    implementation(project(":codiki-domain"))
+    implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-security")
+    implementation("org.apache.tika:tika-core:3.2.3")
+}