Add to open-vsx

[MohamedElashri]

The extension is very useful, however some people use VScodium and would need this extension to be published on Open-vsx martketplace

Some documentation about how to do that is here:

publishing extensions

[BachoSeven]

related to this: #131 for having the correct path for snippets under VSCodium/Code OSS/Insiders etc...