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blockchain_utilities/README.md: add high level "what is this about"

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src/blockchain_utilities/README.md
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@ -4,13 +4,19 @@ Copyright (c) 2014-2015, The Monero Project
## Introduction
The blockchain utilities allow one to convert an old style blockchain.bin file
to a new style database. There are two ways to upgrade an old style blockchain:
The recommended way is to run a `blockchain_export`, then `blockchain_import`.
The other way is to run `blockchain_converter`. In both cases, you will be left
with a new style blockchain.
For importing into the LMDB database, compile with `DATABASE=lmdb`
e.g.
`DATABASE=lmdb make release`
This is also the default compile setting on the blockchain branch.
This is also the default compile setting on the master branch.
By default, the exporter will use the original in-memory database (blockchain.bin) as its source.
This default is to make migrating to an LMDB database easy, without having to recompile anything.