Documention for supported target language versions

## :books: Documentation

### Affected Languages

- [x] `TypeScript` or `Javascript`
- [x] `Python`
- [x] `Java`
- [x] .NET (`C#`, `F#`, ...)
- [x] `Go`

### General Information
* **JSII Version:**
* **Platform:**

### The Question

I could not find information on the README of the jsii repo, nor on the jsii documentation website about what versions of target languages are supported by jsii / jsii-pacmak. I was expecting this kind of information to be found here: https://aws.github.io/jsii/overview/features/

e.g. jsii supports Go version >= x.y.z, Python version >= x.y.z, and so on.

Review the repository README and the jsii documentation page at https://aws.github.io/jsii/overview/features/ to determine where supported target-language versions belong. Document the minimum supported versions for TypeScript/JavaScript, Python, Java, .NET, and Go; done means users can find this information in the README or documentation website.

Written by the indexing model from the issue text.