feat: 스토리 생성 버튼 컴포넌트 생성

frontend/src/components/backlog/StoryCreateButton.tsx

@@ -1,3 +1,18 @@
-const StoryCreateButton = () => <div></div>;
+import Plus from "../../assets/icons/plus.svg?react";
+
+interface StoryCreateButtonProps {
+  onClick: () => void;
+}
+
+const StoryCreateButton = ({ onClick }: StoryCreateButtonProps) => (
+  <button
+    type="button"
+    className="flex items-center justify-center w-full gap-2 py-1 rounded-md bg-middle-green"
+    onClick={onClick}
+  >
+    <Plus width={24} height={24} stroke="white" />
+    <span className="text-white">Story 생성하기</span>
+  </button>
+);
 
 export default StoryCreateButton;