docs: Document gcc and clang toolchains

Document gcc and clang as supported toolchains, and how to switch between them

Signed-off-by: Bernhard Rosenkränzer bernhard.rosenkraenzer.ext@huawei.com

changed milestone to %goofy beta

added teamtoolchain label

assigned to @bero

mentioned in issue docs#1 (closed)

mentioned in issue #17 (closed)

approved this merge request

added 84 commits

• ce4964df...f64a9420 - 83 commits from branch eclipse/oniro-core:kirkstone
• 271079ad - docs: Document gcc and clang toolchains

Compare with previous version

resolved all threads

added 3 commits

• 271079ad...e4ead11a - 2 commits from branch eclipse/oniro-core:kirkstone
• 92756ed6 - docs: Document gcc and clang toolchains

Compare with previous version

approved this merge request

merged