Request: add explanations of capabilities/limitations to README

[DeflateAwning]

1. Does this support embedded systems? Sounds like "not at all".
2. Does this tool promise to compile "the same" as gcc? If no, in what ways is it different?
3. Is code compiled with this tool "as fast" as gcc?
4. Is this code production-ready?
5. Can it be used for tasks which require security? Is it better at these use cases (because, for example, I assume it errors if you access arrays out-of-bounds)?