Add rendering implementation for LWJGL

imgui-binding/src/main/java/imgui/ImVec2.java

@@ -0,0 +1,15 @@
+package imgui;
+
+public class ImVec2 {
+    public static ImVec2 TMP = new ImVec2();
+    public float x;
+    public float y;
+
+    public ImVec2() {
+    }
+
+    public ImVec2(float x, float y) {
+        this.x = x;
+        this.y = y;
+    }
+}