implemented user login.

next: find a solution for routing

core/build.gradle.kts

@@ -0,0 +1,20 @@
+plugins {
+    id("java")
+}
+
+group = "de.srsoftware"
+version = "unspecified"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(platform("org.junit:junit-bom:5.10.0"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+    implementation("org.xerial:sqlite-jdbc:3.49.0.0")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}