Add FAQ for spec

[wonderflow]

There are lots of frequently asked questions:

1. OAM vs CNAB/Helm/Kapitn OAM vs CNAB/Helm/kapitan  #191
2. OAM vs kubernetes-sigs/application [Question] What is the difference of OAM and kubernetes-sigs/application #238
3. Traits startup order How Traits can be composed in order？ #235 traits order #6
4. Component startup order component startup ordering #23
5. how to judge an action is a extened workload or trait

...

[resouer]

nits, It's OAM vs kubernetes-sigs/application, not SIG App.

[LeoLiuYan]

@wonderflow
Can I put together a FAQ list?

[wonderflow]

@LeoLiuYan sure, you could send a PR

[wonderflow]

nits, It's OAM vs kubernetes-sigs/application, not SIG App.

thanks， I updated

[tomkerkhove]

Happy to help where I can as well, but didn't we used to have this back in the day or am I going crazy? 🤔

[wonderflow]

@tomkerkhove We didn't have an FAQ now.

@LeoLiuYan Would you like to do this? Or let me make it?