Resources: New palettes of Zhongshan

[CaiFengXiang0709]

Data source: 1. 官方网站发布的设计标准

Reference link: https://td.gd.gov.cn/dtxw_n/gdjrxw/content/post_4144943.html

Justification: 添加中山的第一条线路

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{"id":"zhongshan","country":"CN","name":{"en":"Zhongshan","zh-Hans":"中山","zh-Hant":"中山"}}

[{"id":"gz18s","colour":"#0047ba","fg":"#fff","name":{"en":"Guangzhou Metro Line 18 South Extension Section (Nanzhong Intercity)","zh-Hans":"广州地铁18号线南延段（南中城际）","zh-Hant":"廣州地鐵18號線南延段（南中城際）"}}]