Minor edits to README

[Rageking8]

Summary of changes:

• Added backticks to improve readability
• Prefer single backtick for inline code/term rather that triple backticks
• Fixed a couple of errors (e.g. Vk::Result (should be lowercase "v"))
• Tweaked some sentences to correct grammer/improve flow
• Attempted to normalize code snippet conventions (e.g. size of indentation, placement of braces, use of spacing, use of qualified identifiers)
• Added links to headers/guides for first references (subsequent references are just enclosing in backticks with no link)
• Added usage of IMPORTANT and NOTE alerts

[CLAassistant]

All committers have signed the CLA.

[asuessenbach]

That's some great improvement to the readme! Thanks a lot for your contribution.

There are just a couple of minor issues I'd like you to resolve.

[Rageking8]

Addressed all feedback given and did another light edit pass over the whole README file. It includes more escaping with backticks, using qualified names, some formatting, and fixing a few more errors found ("IndexType::eUint32" (typo) and "vk::UniqueHandles" (should not have a trailing "s")).

[asuessenbach]

Thanks a lot for this nice improvements of the readme!