doc: add statement about support for dependencies
- In the review of https://github.com/nodejs/node/pull/11872 we pulled out the discussion of supporting dependencies. This PR adds back that statement.
- Update README.md to indicatte BUILDING.md contains the list of supported platforms. ( I missed this part in the original PR)
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows [commit guidelines][]
Affected core subsystem(s)
doc