Created HeadlessTool tool backend

tools/src/main/java/com/riiablo/tool/HeadlessTool.java

@@ -0,0 +1,51 @@
+package com.riiablo.tool;
+
+import com.badlogic.gdx.backends.headless.HeadlessApplication;
+import com.badlogic.gdx.backends.headless.HeadlessApplicationConfiguration;
+
+public class HeadlessTool extends AbstractTool<HeadlessApplication> {
+  public static <T extends Tool>
+  HeadlessToolBuilder<T> create(
+      Class<T> toolClass,
+      String cmd,
+      String[] args
+  ) {
+    return create(toolClass, cmd, args, new HeadlessApplicationConfiguration());
+  }
+
+  public static <T extends Tool>
+  HeadlessToolBuilder<T> create(
+      Class<T> toolClass,
+      String cmd,
+      String[] args,
+      HeadlessApplicationConfiguration config
+  ) {
+    return new HeadlessToolBuilder<>(toolClass, cmd, args, config);
+  }
+
+  public static final class HeadlessToolBuilder<T extends Tool>
+      extends ToolBuilder<
+          HeadlessApplication,
+          T,
+          HeadlessApplicationConfiguration,
+          HeadlessToolBuilder<T>
+      >
+  {
+    HeadlessToolBuilder(
+        Class<T> toolClass,
+        String cmd,
+        String[] args,
+        HeadlessApplicationConfiguration config
+    ) {
+      super(toolClass, cmd, args, config);
+    }
+
+    @Override
+    public HeadlessApplication newInstance(
+        T toolInstance,
+        HeadlessApplicationConfiguration config
+    ) {
+      return new HeadlessApplication(toolInstance, config);
+    }
+  }
+}