vim.wasm installation process

[nongiach]

What is an issue which you want to solve with your feature request?

The installation process of vim.wasm is not documented.

Describe the solution you'd like

Provide installation instruction or provide a Dockerfile for quick deployement.

Thank you, very neat project.

[rhysd]

https://github.com/rhysd/vim.wasm/tree/wasm/wasm#installation