Update readme with dag

README.md

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 RNA-Seq Analytic Pipeline for GUDMAP/RBK
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 Introduction
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 [jeremy.mathews@utsouthwestern.edu](mailto:jeremy.mathews@utsouthwestern.edu)
 
 Please cite in publications: Pipeline was developed by BICF from funding provided by **Cancer Prevention and Research Institute of Texas (RP150596)**.
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+Pipeline Directed Acyclic Graph
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+![dag](docs/dag.png "DAG")
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