add documentation for monero-blockchain-stats

src/blockchain_utilities/blockchain-stats-readme.md

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+# Monero Blockchain Stats
+
+Monero Blockchain Stats utlity exports daily statistics for the monero blockchain from creation through current state.
+
+## Usage:
+
+See also the utility's help option. `monero-blockchain-stats --help`
+
+From the command line run:
+
+`$ monero-blockchain-stats`
+
+This loads the existing blockchain and prints the results to the terminal. Default printed data includes Blocks per Day, Total Blocks,	Transactions per Day, Total Transactions, Bytes per Day and Total Bytes. The format of the output is in tab delimited csv which is printed to the console. Piping the output of the command to a csv file allows for saving the output of the utilty to a file.
+i.e. `monero-blockchain-stats > stats.csv` 
+
+### Options
+`--data-dir arg` 
+to specify location of blockchain storage
+
+`--testnet` 
+Run on testnet.
+
+`--stagenet`
+Run on stagenet.
+
+`--log-level arg`
+0-4 or categories
+
+`--block-start arg (=0)`
+start at block number
+
+`--block-stop arg (=0)`
+Stop at block number
+
+`--with-inputs`
+with input stats
+
+`--with-outputs`
+with output stats
+
+`--with-ringsize`
+with ringsize stats
+
+`--with-hours`
+with txns per hour
+
+`--with-emission`
+with coin emission
+
+`--with-fees`
+with txn fees
+
+`--with-diff`
+with difficulty