rename documentation

documentation/Examples/README.md

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+## 样例
+
+1. [与Scrapy集成](/Examples/ScrapyIntegration.md)
+

documentation/Examples/ScrapyIntegration.md

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+### 与Scrapy集成
+
+以下是Crawlab跟`Scrapy`集成的例子，利用了Crawlab传过来的`task_id`和`collection_name`。
+
+```python
+import os
+from pymongo import MongoClient
+
+MONGO_HOST = '192.168.99.100'
+MONGO_PORT = 27017
+MONGO_DB = 'crawlab_test'
+
+# scrapy example in the pipeline
+class JuejinPipeline(object):
+    mongo = MongoClient(host=MONGO_HOST, port=MONGO_PORT)
+    db = mongo[MONGO_DB]
+    col_name = os.environ.get('CRAWLAB_COLLECTION')
+    if not col_name:
+        col_name = 'test'
+    col = db[col_name]
+
+    def process_item(self, item, spider):
+        item['task_id'] = os.environ.get('CRAWLAB_TASK_ID')
+        self.col.save(item)
+        return item
+```