add litex_ls180.mdwn

diff --git a/HDL_workflow/litex_ls180.mdwn b/HDL_workflow/litex_ls180.mdwn
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+# Commits for litex:
+
+the following have been identified as working with sim.py:
+
+    litex commit 35929c0f8a8f1cc098a6b6ebb569caca8df8c08d 
+    litedram commit 198bcbab676e2b4065e5b6a7dc8a7733bae8315a
+    pythondata-cpu-microwatt commit ba76652320e9dc23d9b2c64a62d0a752c870a215 
+