added picocli

Author: DashProsh

app/Makefile

@@ -0,0 +1,8 @@
+build-dist:
+	./gradlew run
+
+run-dist: build-dist
+	/bin/sh ./build/install/app/bin/app
+
+run:
+	./build/install/app/bin/app

app/build.gradle.kts

@@ -23,6 +23,7 @@ dependencies {
     testImplementation(platform("org.junit:junit-bom:5.10.3"))
     testImplementation("org.junit.jupiter:junit-jupiter")
     implementation("org.apache.commons:commons-lang3:3.13.0")
+    implementation("info.picocli:picocli:4.7.6")
 }
 
 tasks.test {

app/src/main/java/hexlet/code/App.java

@@ -1,7 +1,27 @@
 package hexlet.code;
 
-public class App {
+import picocli.CommandLine;
+import picocli.CommandLine.Command;
+import picocli.CommandLine.Option;
+
+
+@Command(name = "gendiff", mixinStandardHelpOptions = true, version = "gendiff 1.1.1",
+        description = "Compares two configuration files and shows a difference.")
+
+class App implements Runnable {
+
+    @Option(names = { "-h", "--help" }, usageHelp = true, description = "Show this help message and exit.")
+    boolean usageHelpRequested;
+
+    @Option(names = { "-V", "--version" }, versionHelp = true, description = "Print version information and exit.")
+    boolean versionInfoRequested;
+
+    @Override
+    public void run () {
+        System.out.println("Use -h or --help to see available options.");
+    }
+
     public static void main(String[] args) {
-        System.out.println("Hello World!");
+        new CommandLine(new App()).execute(args);
     }
-}
+}

app/src/main/java/hexlet/code/Differ.java

@@ -0,0 +1,4 @@
+package hexlet.code;
+
+public class Differ {
+}