add raygui example

Makefile

@@ -1,21 +1,28 @@
-all: app
+TARGET = app
+CC = gcc -std=c23 -ggdb -Wall -Wextra -pedantic -O0
+INC = -I./raylib/include
+LIB_PATH = -L./raylib/lib
+LIBS = -lraylib \
+	   -lm
 
-app: main.c
-	@gcc -std=c23 -ggdb -Wall -Wextra -pedantic -O0 main.c -o app
+all: $(TARGET)
+
+$(TARGET): main.c
+	@$(CC) $(INC) $(LIB_PATH) main.c -o $(TARGET) $(LIBS)
 
 .PHONY: clean run test debug
 
 clean:
-	@rm -rf app
+	@rm -rf $(TARGET)
 
-run: app
-	-@./app
-	@rm -rf app
+run: $(TARGET)
+	-@./$(TARGET)
+	@rm -rf $(TARGET)
 
-test: app
-	@valgrind ./app
-	@rm -rf app
+test: $(TARGET)
+	@valgrind ./$(TARGET)
+	@rm -rf $(TARGET)
 
-debug: app
-	@gdb ./app
-	@rm -rf app
+debug: $(TARGET)
+	@gdb ./$(TARGET)
+	@rm -rf $(TARGET)