Update README.md

@@ -6,6 +6,12 @@ Our Test Sequence
 
 Reference Software
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+HEVC (HM 16.8): [Download HM][TortoiseSVM]
+[TortoiseSVM]: https://tortoisesvn.net/downloads.html "Download HM"
+VVC (vtm 12.1): [Download VTM][Fraunhofer]
+[Fraunhofer]: https://vcgit.hhi.fraunhofer.de/jvet/VVCSoftware_VTM/-/tags "Download VTM"
+    [Download Documents][Fraunhofer]
+[Fraunhofer]:  https://jvet.hhi.fraunhofer.de/ "Common Test Condition"
 
 Our Proposed Codec
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@@ -14,4 +20,8 @@ Step
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 Code explanation
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+-------------
+### PreProcessing
+
+### PostProcessing
+### Our Codec
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