Created Mediaserver setup (markdown)

Mediaserver-setup.md

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+Go to https://caddyserver.com/download   
+Enable `http.upload` as plugin
+
+Make sure the process you're running caddy with has read/write access to `/var/www/upload/`
+
+Sample Caddyfile
+```
+yourserver.com:443 {
+   log stdout
+   root /var/www/upload/
+   browse
+   basicauth /web/upload a_user a_password
+   upload /upload {
+      to "/var/www/upload/"
+   }
+}
+```