Add vcpkg configuration files

[hallfox]

This should be the minimal set of files to support a vcpkg-backed toolchain. Further instructions on how one can add more dependencies for to be fetched by vcpkg can be found at the getting started page on vcpkg's docs.

[JeffGarland]

@bretbrownjr this seems to be languishing -- can you have a look?

[wusatosi]

This conflicts with #44, I can look into this after #44 is merged.

[wusatosi]

@hallfox would you mind rebasing this pr to adopt the CMakePresets.json from #44?

[steve-downey]

+1

[JeffGarland]

I'm not really qualified to review this, but I'm approving so we can move forward.

[wusatosi]

Anyway we can test this?

[hallfox]

Best way would be to add a vcpkg based toolchain to the CI matrix.

[wusatosi]

I cannot verify this, the added file doesn't seem to effect vcpkg toolchain at all.

This is what I've attempted:

1. installed the vcpkg environment as suggested on the referenced setup instruction
2. Passed -DCMAKE_TOOLCHAIN_FILE=$VCPKG_ROOT/scripts/buildsystems/vcpkg.cmake to cmake configure on a ubuntu 20.04 based codespace environment
3. Project builds correctly.
4. Removes the build directory
5. Corrupts the files in this pr
6. Configures with the same tool chain
7. Project still builds successfully

Again I am not familiar with this tool chain, I am just confused on what these two files adds....

[camio]

Best way [to test] would be to add a vcpkg based toolchain to the CI matrix.

@hallfox, do you intend to add something like this as part of this PR? If not, is there a series of commands we can run manually to verify that this works as expected.

[wusatosi]

I have opened a pr for the CI side of vcpkg configuration, see #68 . It is still a work in process.
Should be ready to merge.