[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

.gitmodules

@@ -19,3 +19,6 @@
 [submodule "include/imgui-node-editor"]
 	path = include/imgui-node-editor
 	url = https://github.com/thedmd/imgui-node-editor
+[submodule "include/imgui_club"]
+	path = include/imgui_club
+	url = https://github.com/ocornut/imgui_club