feat: 小红书笔记搜索，评论获取done

docs: update docs

Create .gitattributes

Update README.md

base_crawler.py

@@ -0,0 +1,23 @@
+from abc import ABC, abstractmethod
+
+
+class Crawler(ABC):
+    @abstractmethod
+    def init_config(self, **kwargs):
+        pass
+
+    @abstractmethod
+    async def start(self):
+        pass
+
+    @abstractmethod
+    async def login(self):
+        pass
+
+    @abstractmethod
+    async def search_posts(self):
+        pass
+
+    @abstractmethod
+    async def get_comments(self, item_id: int):
+        pass