Add XDG Base Directories

[codecov-commenter]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (9aff411) 86.71% compared to head (96e00e0) 86.18%.

Files	Patch %	Lines
...Mods.Paths/FileSystemAbstraction/BaseFileSystem.cs	10.00%	18 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #32 +/- ## ========================================== - Coverage 86.71% 86.18% -0.54% ========================================== Files 42 42 Lines 2861 2881 +20 Branches 494 497 +3 ========================================== + Hits 2481 2483 +2 - Misses 324 342 +18 Partials 56 56 ``` | [Flag](https://app.codecov.io/gh/Nexus-Mods/NexusMods.Paths/pull/32/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nexus-Mods) | Coverage Δ | | |---|---|---| | [Linux](https://app.codecov.io/gh/Nexus-Mods/NexusMods.Paths/pull/32/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nexus-Mods) | `85.76% <10.00%> (-0.53%)` | :arrow_down: | | [Windows](https://app.codecov.io/gh/Nexus-Mods/NexusMods.Paths/pull/32/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nexus-Mods) | `85.76% <10.00%> (-0.53%)` | :arrow_down: | | [macOS](https://app.codecov.io/gh/Nexus-Mods/NexusMods.Paths/pull/32/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nexus-Mods) | `85.69% <10.00%> (-0.53%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nexus-Mods#carryforward-flags-in-the-pull-request-comment) to find out more.

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