feat(tianmu) Add upgrade directory (#510)

stoneatom · Sep 19, 2022 · d088585 · d088585
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diff --git a/storage/tianmu/upgrade/readme.txt b/storage/tianmu/upgrade/readme.txt
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+The Tianmu engine needs an upgrade tools, which provides some tools for 
+upgrade Tianmu from an old version to a new version. 
+The new version maybe changes the format of meta-data or format of data. 
+These format change will lead the new version of StoneDB can read the old-format data. 
+Therefore, StoneDB should provide an upgrading solution.
+
+All our information about Tianmu upgrading is in this directory.