PD-2779: Add README file for CEMBA file path deprecation (#1412)

* add readme

* add readme

* fix readme

* added whitelsit

deprecated/pipelines/cemba/cemba_methylcseq/README.md

@@ -1,6 +1,8 @@
 ## Announcement: CEMBA is Deprecated 9/12/2024
 
-The CEMBA workflow is deprecated and is no longer supported. However, the CEMBA documentation is still available. See [CEMBA Pipeline Overview](https://broadinstitute.github.io/warp/docs/Pipelines/CEMBA_MethylC_Seq_Pipeline/README) on the [WARP documentation site](https://broadinstitute.github.io/warp/)!
+The CEMBA workflow is deprecated and no longer supported. File paths in the JSON file are also no longer supported.
+
+However, the CEMBA documentation is still available. See [CEMBA Pipeline Overview](https://broadinstitute.github.io/warp/docs/Pipelines/CEMBA_MethylC_Seq_Pipeline/README) on the [WARP documentation site](https://broadinstitute.github.io/warp/)! The CEMBA data is also available on the NEMO data portal. The whitelist includes the following barcodes: CTCACG, CAGATC, CGATGT, ACTTGA, TTAGGC, GATCAG, TGACCA, TAGCTT, ACAGTG, GGCTAC, GCCAAT, CTTGTA.
 
 ### CEMBA summary