Aadd yarn

[marouenbg]

• I added YARN source code from https://bioconductor.org/packages/release/bioc/html/yarn.html cc @jnpaulson

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 240 lines in your changes are missing coverage. Please review.

Project coverage is 37.35%. Comparing base (67e59ac) to head (214341b).

Files	Patch %	Lines
R/YARN.R	0.00%	240 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## devel #314 +/- ## ========================================== - Coverage 40.49% 37.35% -3.14% ========================================== Files 23 24 +1 Lines 2857 3097 +240 ========================================== Hits 1157 1157 - Misses 1700 1940 +240 ```

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