Add Google Research logo to the adopters page

adopters/index.md

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+<a href= "https://research.google/"><img src="../adopters/logos/google_research.png" alt="Google Research" width="600" height="400"></a>
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+<font size="3">→ Google Research has released a number of open source projects for working with Zarr data (including <a href="https://github.com/google/neuroglancer/">Neuroglancer</a>, <a href="https://github.com/google/tensorstore/">TensorStore</a>, <a href="https://github.com/google/xarray-beam/">Xarray-Beam</a>, and <a href="https://github.com/google/xarray-tensorstore/">Xarray-TensorStore</a>) and uses Zarr for distributing <a href="https://github.com/google-research/arco-era5/">large-scale weather datasets</a>.</font>
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 <a href="https://www.janelia.org/"><img src="../adopters/logos/hhmi.png" alt="HHMI" width="600" height="300"></a>
 
 <font size="3">→ Zarr is used extensively within Janelia Research Campus for efficiently storing and accessing large imaging datasets</font>