add documentation

README.md

 # hep-workloads-GPU
 
-Build standalone reference HEP workloads for benchmarking purposes on GPUs
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+Build standalone reference HEP workloads for benchmarking purposes on GPUs
+
+The documentation of the individual workloads can be found in the following links
+
+## Notebooks
+
+| Internal Doc | Note | External Link | 
+| :--- | :--- | :--- |
+| [Simple Track](https://gitlab.cern.ch/hep-benchmarks/hep-workloads-gpu/-/blob/master/lhc/simpletrack/README.md)    |  Simulation of LHC turning particles | tbd |
+| [CMS Patatrack](https://gitlab.cern.ch/hep-benchmarks/private-tools/tree/master/Analysis/Notebooks/templates)    | CMS HLT Reconstruction code | [CMS patatrack github project](https://github.com/cms-patatrack) |