Add android-related example to existing SDL3 examples

examples/example_android_sdlrenderer3/Makefile

@@ -1,57 +0,0 @@
-# Variables
-PACKAGE_NAME := com.imgui.example
-VARIANT := copy
-VERSION := 0.1.0
-URL := https://github.com/libsdl-org/SDL/archive/refs/heads/main.zip
-ARCHIVE_NAME := SDL-main.zip
-SDL_ROOT := SDL-main
-SDL_ANDROID_PROJECT := $(CURDIR)/$(PACKAGE_NAME)
-SDL_PYTHON_SCRIPT := $(SDL_ROOT)/build-scripts/create-android-project.py
-SDL_JNI_DIR := $(SDL_ANDROID_PROJECT)/app/jni/src
-IMGUI_ROOT := $(realpath $(dir $(lastword $(MAKEFILE_LIST)))../..)
-
-SOURCES := \
-	$(IMGUI_ROOT)/backends/imgui_impl_sdlrenderer3.cpp \
-	$(IMGUI_ROOT)/backends/imgui_impl_sdl3.cpp \
-	$(IMGUI_ROOT)/imgui.cpp \
-	$(IMGUI_ROOT)/imgui_draw.cpp \
-	$(IMGUI_ROOT)/imgui_widgets.cpp \
-	$(IMGUI_ROOT)/imgui_demo.cpp \
-	$(IMGUI_ROOT)/imgui_tables.cpp \
-	main.cpp
-
-HEADERS := $(IMGUI_ROOT)/imstb_rectpack.h \
-	$(IMGUI_ROOT)/imstb_textedit.h \
-	$(IMGUI_ROOT)/imstb_truetype.h \
-	$(IMGUI_ROOT)/imgui.h \
-	$(IMGUI_ROOT)/imgui_internal.h \
-	$(IMGUI_ROOT)/imconfig.h \
-	$(IMGUI_ROOT)/backends/imgui_impl_sdl3.h \
-	$(IMGUI_ROOT)/backends/imgui_impl_sdlrenderer3.h
-
-# Targets
-.PHONY: all clean setup download extract run
-
-all: setup run
-
-clean:
-	rm -rf $(SDL_ROOT) $(ARCHIVE_NAME) $(SDL_ANDROID_PROJECT)
-
-setup: download extract
-	@echo "Setting up the Android project..."
-	@which python3 > /dev/null || which python > /dev/null || { echo "Error: Python v3 is not installed."; exit 1;}
-
-download:
-	@echo "Downloading Android project..."
-	wget -O $(ARCHIVE_NAME) $(URL) || curl -L -o $(ARCHIVE_NAME) $(URL)
-
-extract:
-	@echo "Extracting Android project..."
-	mkdir -p $(SDL_ROOT)
-	unzip -o $(ARCHIVE_NAME) -d $(CURDIR)
-	cp -r $(HEADERS) $(SDL_JNI_DIR)
-
-run:
-	@echo "Creating Android project..."
-	python3 $(SDL_PYTHON_SCRIPT) --variant $(VARIANT) --output $(CURDIR) $(PACKAGE_NAME) $(SOURCES)
-