#852 Adding instructions to add submodules when cloning the repository

[bulldetektor]

Fixes #852

[CLAassistant]

All committers have signed the CLA.

[JimBobSquarePants]

Much appreciated!

[codecov]

Codecov Report

Merging #853 into master will decrease coverage by 0.1%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #853      +/-   ##
==========================================
- Coverage   88.89%   88.79%   -0.11%     
==========================================
  Files        1014     1014              
  Lines       44295    44295              
  Branches     3208     3208              
==========================================
- Hits        39376    39331      -45     
- Misses       4198     4203       +5     
- Partials      721      761      +40

Impacted Files	Coverage Δ
...xelFormats/PixelOperations{TPixel}.PixelBenders.cs	89.34% <0%> (-9.84%)	⬇️
...Processing/Processors/Transforms/TransformUtils.cs	88.29% <0%> (-5.32%)	⬇️
src/ImageSharp/Common/Helpers/ImageMaths.cs	82.05% <0%> (-5.13%)	⬇️
.../Processing/Processors/Transforms/CropProcessor.cs	96% <0%> (-4%)	⬇️
...ocessing/Processors/Dithering/ErrorDiffuserBase.cs	93.75% <0%> (-3.13%)	⬇️
...rs/Normalization/HistogramEqualizationProcessor.cs	97.5% <0%> (-2.5%)	⬇️
...ormats/Jpeg/Components/Decoder/QualityEvaluator.cs	94.04% <0%> (-2.39%)	⬇️
...eSharp.Tests/IO/DoubleBufferedStreamReaderTests.cs	97.61% <0%> (-2.39%)	⬇️
.../ImageSharp.Tests/TestUtilities/TestEnvironment.cs	79.16% <0%> (-2.09%)	⬇️
...p/Formats/Jpeg/Components/Decoder/JpegComponent.cs	94.11% <0%> (-1.97%)	⬇️
... and 14 more

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