add Makefiel

Makefile

+init:
+	pip install -i https://pypi.tuna.tsinghua.edu.cn/simple -r requirements.txt
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README.md

@@ -273,6 +273,12 @@ img = handle_from_path(path)        # 类似cv2.imread的img
 from demo.three_color import handle_from_url
 url = 'http://xxx/xxx/xx.jpg'
 img = handle_from_url(url) 
+```
+或者
+```shell
+git clone git@git.wanmeizhensuo.com:wushengyu/maskrcnn.git
+cd maskrcnn-benchmark
 
-
+make init
+python setup.py build develop
 ```
\ No newline at end of file