readme: Add note regarding submodule sync and update

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George Lee Ge 2021-04-05 22:14:44 +00:00 committed by selsta
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@ -213,6 +213,10 @@ If you already have a repo cloned, initialize and update:
`$ cd monero && git submodule init && git submodule update`
*Note*: If there are submodule differences between branches, you may need
to use ```git submodule sync && git submodule update``` after changing branches
to build successfully.
### Build instructions
Monero uses the CMake build system and a top-level [Makefile](Makefile) that