feat: first player progress display

app/src/main/java/gui/widget/SmoothProgressBar.java

@@ -0,0 +1,21 @@
+package gui.widget;
+
+import imgui.ImGui;
+import imgui.ImVec2;
+
+public class SmoothProgressBar {
+
+	private float lastProgress = 0;
+	private final float speed = 2.0f;
+	private final float clipConstant = 0.001f;
+
+	public void render(String label, ImVec2 size, float progress) {
+		float delta = progress - lastProgress;
+		if (Math.abs(delta) < clipConstant)
+			lastProgress = progress;
+		else
+			lastProgress = lastProgress + delta * ImGui.getIO().getDeltaTime() * speed;
+		ImGui.progressBar(lastProgress, size, label);
+	}
+
+}