Created Nginx Log Configuration (markdown)

Nginx-Log-Configuration.md

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+Set nginx access log and error log path in `app.ini` then restart nginx-ui.
+
+Example:
+```
+[nginx_log]
+AccessLogPath = /var/log/nginx/access.log
+ErrorLogPath = /var/log/nginx/error.log
+```
+
+For nginx-ui **docker** users, if you upgrading from `v1.5.2` or lower version, 
+please add another `access_log` and `error_log` directive in your `nginx.conf` before setting the `app.ini`.
+
+Because in nginx-ui container, `/var/log/nginx/access.log` is a symlink point to `/dev/stdout`, `/var/log/nginx/error.log` is a symlink point to `/dev/stderr`, so that you can view the nginx and nginx-ui log by using `docker logs nginx-ui`, but these two devices are not allow to tail, so we must 
+use another log file to record nginx logs.
+
+Example:
+```
+error_log  /var/log/nginx/error.log notice;
+error_log  /var/log/nginx/error.local.log notice;
+
+http {
+    ...
+    access_log  /var/log/nginx/access.log  main;
+    access_log  /var/log/nginx/access.local.log  main;
+    ...
+}
+```
+
+Then, set nginx access log and error log path in `app.ini` and restart nginx-ui.
+
+Example:
+```
+[nginx_log]
+AccessLogPath = /var/log/nginx/access.local.log
+ErrorLogPath = /var/log/nginx/error.local.log
+```