Add chapter on rendering multiple objects

[SaschaWillems]

Add extra chapter to tutorial which adds in the necessary code to allow for drawing of multiple objects. Noting what needs to and doesn’t need to be duplicated (multiple uniform buffers but 1 vkPipeline, etc).
Reason: Shows newcomers to the API how to draw many things, shows how all the different concepts in vulkan fit together, last ‘big thing’ needed to allow people to feel capable of moving forward

Dependencies: Command buffer recording

Note: Copied from the old repo's project board

[dgubser]

Adding the extra chapter would be a huge benefit. Thank you for thinking of it. I will look forward to seeing it.