Adding support for .vs, .v, .vsh, .svh filetypes

[gandhimaulik]

Many companies uses different extensions for verilog/systemverilog files. As systemverilog covers verilog systax highlighting, this extension should support .v , .vs extensions

[bjaminn]

imho, assigning .v files to systemverilog would cause issues with the verilog plugin. Yout can add per project of custom extension assignments with the following setting: "files.associations"

[mshr-h]

First of all, thank you for sending me a pull request.

But I don't merge your PR. Because this is an extension for supporting SystemVerilog. If you need Verilog HDL support, you can use this one (mshr-h/vscode-verilog-hdl-support) or change file association with "files.associations" setting as @bjaminn mentioned.