[Templates v2] Add a proposal for how templates should work

[movermeyer]

Here's my proposal for how templates should work within Foam (as requested here).

You're going to want to view the rendered version of this file.

@riccardoferretti, did the file have to be called docs/specs/templates-v2.md? I went with docs/proposals/templates-v2.md instead.

---

cc @ingalless @riccardoferretti

[ingalless]

Thank you for this write up @movermeyer!

[movermeyer]

@riccardoferretti @ingalless

I'm not sure what you want the end result of this PR to be. Do we merge this? Close this?
I've started implementation of ${title} here

[ingalless]

@riccardoferretti I was thinking it might be nice to get some tasks up on the project board based on the proposal?

cc @movermeyer

[riccardoferretti]

This proposal looks good to me.
Let's just be clear where we are asking for titles vs filenames, this can be confusing - I left a comment in that regard

[ingalless]

@riccardoferretti Good idea! @movermeyer I imagine you have access to the project board? Do you think you can split the proposal out into PR-able tasks once the proposal is fully ironed out?

[movermeyer]

@riccardoferretti @ingalless I've created new issues (#560-#566) to capture the work related to this proposal.