add readme

README.md

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+# aws 服务 
+
+收集一些aws的服务实现
+
+aws-sdk: https://github.com/aws/aws-sdk-go
+
+### 文件上传
+```
+url: /upload
+method: post
+name: file
+
+success:
+{
+    "code": 0,
+    "data": "https://oceanapps.s3.ap-east-1.amazonaws.com/upload/15840111554a47a0db6e60853dedfcfdf08a5ca249..png",
+    "msg": "文件上传成功"
+}
+
+failed:
+{
+    "code": 504,
+    "data": "http: no such file",
+    "msg": "文件上传失败"
+}
+```
+