Update nodejs readme
Add LLVM dependency
Node.js binding to the IOTA wallet library.
-## Requirements
+## Requirements (only for building the binary yourself)
-Ensure you have first installed the required dependencies for the library [here](https://github.com/iotaledger/wallet.rs/blob/dev/README.md).
+Ensure you have first installed the required dependencies for the library [here](https://github.com/iotaledger/wallet.rs/blob/dev/README.md) and on Windows also LLVM, our workflow uses `https://github.com/llvm/llvm-project/releases/download/llvmorg-11.0.1/LLVM-11.0.1-win64.exe`.
## Installation
-Currently the package isn't published so you'd need to link it to your project using `npm` or `yarn`.
-
- Using NPM:
```
-$ npm i @iota/wallet
+npm i @iota/wallet
```
- Using yarn:
```
-$ yarn add @iota/wallet
+yarn add @iota/wallet
```
## Documentation
