Add rendering implementation for LWJGL

imgui-binding/src/main/java/imgui/ImGuiDouble.java

@@ -0,0 +1,27 @@
+package imgui;
+
+public class ImGuiDouble {
+    public static ImGuiDouble TMP = new ImGuiDouble();
+
+    double[] data = new double[]{0.0d};
+
+    public ImGuiDouble() {
+    }
+
+    public ImGuiDouble(double value) {
+        setValue(value);
+    }
+
+    public double getValue() {
+        return this.data[0];
+    }
+
+    public void setValue(double value) {
+        this.data[0] = value;
+    }
+
+    @Override
+    public String toString() {
+        return String.valueOf(getValue());
+    }
+}