Add RetailManagementSystem app

RetailManagementSystem/back-end/build.gradle

@@ -0,0 +1,32 @@
+import org.springframework.boot.gradle.plugin.SpringBootPlugin
+
+apply plugin: 'java'
+apply plugin: 'org.springframework.boot'
+apply plugin: 'io.spring.dependency-management'
+
+description = "Retail management system"
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencyManagement {
+    imports {
+        mavenBom SpringBootPlugin.BOM_COORDINATES
+    }
+}
+
+dependencies {
+    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+    implementation 'org.springframework.boot:spring-boot-starter-data-mongodb'
+    implementation 'org.springframework.boot:spring-boot-starter-validation'
+    implementation 'org.springframework.boot:spring-boot-starter-web'
+    runtimeOnly 'org.springframework.boot:spring-boot-devtools'
+    runtimeOnly 'com.mysql:mysql-connector-j'
+    testImplementation 'org.springframework.boot:spring-boot-starter-test'
+}