curl: add Chinese translaion (partial)

pages.zh/common/curl.md

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+# curl
+
+> 向/从一个服务器传输数据.
+> 支持大多数协议, 包括 HTTP, FTP, 和 POP3.
+> 更多信息: <https://curl.haxx.se>.
+
+- 将指定URL的内容下载到文件:
+
+`curl {{http://example.com}} -o {{文件名}}`
+
+- 将文件从URL保存到由URL指示的文件名中:
+
+`curl -O {{http://example.com/文件名}}`
+
+- 下载文件, 跟随 [L]重定向, 并且自动 [C]续传(恢复)前序文件传输:
+
+`curl -O -L -C - {{http://example.com/文件名}}`
+
+- Send form-encoded data (POST request of type `application/x-www-form-urlencoded`):
+
+`curl -d {{'name=bob'}} {{http://example.com/form}}`
+
+- Send a request with an extra header, using a custom HTTP method:
+
+`curl -H {{'X-My-Header: 123'}} -X {{PUT}} {{http://example.com}}`
+
+- Send data in JSON format, specifying the appropriate content-type header:
+
+`curl -d {{'{"name":"bob"}'}} -H {{'Content-Type: application/json'}} {{http://example.com/users/1234}}`
+
+- Pass a user name and password for server authentication:
+
+`curl -u myusername:mypassword {{http://example.com}}`
+
+- Pass client certificate and key for a resource, skipping certificate validation:
+
+`curl --cert {{client.pem}} --key {{key.pem}} --insecure {{https://example.com}}`