update project structure & create Makefile

Makefile

@@ -0,0 +1,31 @@
+# Many thanks to this guy -> https://stackoverflow.com/questions/30573481/how-to-write-a-makefile-with-separate-source-and-header-directories
+SRC_DIR := src
+OBJ_DIR := obj
+BIN_DIR := bin
+
+EXE := $(BIN_DIR)/main
+SRC := $(wildcard $(SRC_DIR)/*.c)
+OBJ := $(SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)
+
+CPPFLAGS := -Iinclude -MMD -MP
+CFLAGS   := -Wall
+LDFLAGS  := -Llib
+LDLIBS   := -lm
+
+.PHONY: all clean
+
+all: $(EXE)
+
+$(EXE): $(OBJ) | $(BIN_DIR)
+	$(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@
+
+$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIR)
+	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@
+
+$(BIN_DIR) $(OBJ_DIR):
+	mkdir -p $@
+
+clean:
+	@$(RM) -rv $(BIN_DIR) $(OBJ_DIR)
+
+-include $(OBJ:.o=.d)