[API] Memory editor extension (#110)

* Working on memory editor bindings for SpaiR/imgui-java#109

* Initial working implementation

* Add mising entry for imgui_club in .gitmodules

* Sorry, fixing readme link type and description for memory editor.

* Rename .club package to .memedit

* Rename _club.h to _memedit.h

example/src/main/java/ExampleImGuiMemoryEditor.java

@@ -0,0 +1,48 @@
+import imgui.extension.memedit.MemoryEditor;
+import imgui.flag.ImGuiCond;
+import imgui.internal.ImGui;
+import imgui.type.ImBoolean;
+import org.lwjgl.system.MemoryUtil;
+
+import java.awt.*;
+import java.net.URI;
+import java.nio.ByteBuffer;
+
+public class ExampleImGuiMemoryEditor {
+    private static final String URL = "https://github.com/ocornut/imgui_club";
+    private static ByteBuffer demoData;
+    private static MemoryEditor memoryEditor;
+    private static ImBoolean showingMemoryEditor = new ImBoolean(false);
+
+    static {
+        demoData = MemoryUtil.memASCII("Welcome to the demo for Dear ImGui Memory Editor." +
+            "\n The git repo is located at " + URL + "." +
+            "You can use this memory editor to view the raw memory values at some pointer location.");
+
+        memoryEditor = new MemoryEditor();
+    }
+
+    public static void show(ImBoolean showImGuiMemoryEditor) {
+        ImGui.setNextWindowSize(400, 200, ImGuiCond.Once);
+        ImGui.setNextWindowPos(ImGui.getMainViewport().getPosX() + 100, ImGui.getMainViewport().getPosY() + 100, ImGuiCond.Once);
+        if (ImGui.begin("ImGuiMemoryEditor Demo", showImGuiMemoryEditor)) {
+            ImGui.text("This a demo for ImGui MemoryEditor");
+
+            ImGui.alignTextToFramePadding();
+            ImGui.text("Repo:");
+            ImGui.sameLine();
+            if (ImGui.button(URL)) {
+                try {
+                    Desktop.getDesktop().browse(new URI(URL));
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+            ImGui.checkbox("Memory Editor", showingMemoryEditor);
+            if (showingMemoryEditor.get()) {
+                memoryEditor.drawWindow("Example Data", MemoryUtil.memAddress(demoData), demoData.capacity());
+            }
+        }
+        ImGui.end();
+    }
+}