added imgui changelog

README.md

@@ -73,6 +73,7 @@ Building on macOS is currently not supported.
 Todo
 
 # Documentation
+The following is a documentation for all the code used in the project. As the project is currently at development halt, there are a few known issues that can not be addressed for the time being. They are pointed out in their respective sections.
 ## Architecture
 Todo
 ## Classes
@@ -111,7 +112,19 @@ Todo
 Todo
 
 ## ImGui Customization
-Todo
+The ImGui library has been customized in the following way:
+- *`imgui_widgets.cpp`*:
+    - `ImGui::PlotEx`: Removed tooltip
+- *`imgui_impl_sdl.h`*:
+    - `ImGui_ImplSDL2_Touch_ProcessEvent`: Added declaration
+    - `ImGui_ImplSDL2_Touch_UpdateMousePosAndButtons`: Added declaration
+- *`imgui_impl_sdl.cpp`*:
+    - `ImGui_ImplSDL2_Touch_ProcessEvent`: Added implementation
+    - `ImGui_ImplSDL2_Touch_UpdateMousePosAndButtons`: Added implementation
+    - `ImGui_ImplSDL2_NewFrame`: Changed to call `ImGui_ImplSDL2_Touch_UpdateMousePosAndButtons` instead of `ImGui_ImplSDL2_UpdateMousePosAndButtons`
+- *Notes*:
+    - On touch devices, one should generally call `ImGui_ImplSDL2_Touch_ProcessEvent` rather than `ImGui_ImplSDL2_ProcessEvent`
+    - To run `ImGui` demos, one must revert the change to `ImGui_ImplSDL2_NewFrame` (see comments).
 
 ## GLSL Shaders
 Todo