New logo

[pdimens]

closes #245.

• this includes the rendered PNG, along with the source SVG file.
• README has been updated to include the new logo, along with some additional formatting to make it look decent with the added logo

[lazarusA]

Apologies, but, could you fix a little bit the perceptiveness, so the view from the top looks closer to this:

otherwise, this is also fine.

[pdimens]

I'm sorry, I don't have any more time to continue working on this. The source SVG file is included for whomever wants to tackle your proposed changes.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4364016) 75.31% compared to head (a5fe323) 75.31%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #253 +/- ## ======================================= Coverage 75.31% 75.31% ======================================= Files 12 12 Lines 1831 1831 ======================================= Hits 1379 1379 Misses 452 452 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDataCubes). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaDataCubes)

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[lazarusA]

no worries. Thanks again.