Add zig file support
**Requirements**

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- [x] I have searched the [issues](https://github.com/ryanoasis/nerd-fonts/issues) for my request and found nothing related and/or helpful
- [x] I have searched the [FAQ](https://github.com/ryanoasis/nerd-fonts/wiki/FAQ-and-Troubleshooting) for help
- [x] I have searched the [Wiki](https://github.com/ryanoasis/nerd-fonts/wiki) for help

**Is your feature request related to a problem? Please describe.**
I do programming in zig casually and at times, I find it annoying not seeing the icon

**Describe the solution you'd like**
I want zig logo to be added in nerdfonts. This repo https://github.com/ziglang/logo contains the icons with relevant license. Since I am not used to submitting PR for nerdfonts, I request someone to do it
