Update README.md

@@ -6,6 +6,12 @@ Our Test Sequence
 
 Reference Software
 -------------
+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
 -------------
@@ -15,3 +21,7 @@ Step
 
 Code explanation
 -------------
+### PreProcessing
+
+### PostProcessing
+### Our Codec
\ No newline at end of file