更新文档

README.md

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 # 德国相机
+
+# mongodb 参考：
+https://blog.csdn.net/zhj_1121/article/details/108230827
+
     demo-url:
     api:http://indoor.popsmart.cn:8084/sxswsw/api/site_model/within?location=120.58645186143931&location=29.991567318555767&location=1.1677126884460454&type=BUILDING
     demo:http://indoor.popsmart.cn:8084/sxswsw-sx/