bitcoin-cli: add page (#3174)

pages/common/bitcoin-cli.md

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+# bitcoin-cli
+
+> Command-line client to interact with the Bitcoin daemon via RPC calls.
+> Uses the configuration defined in `bitcoin.conf`.
+> More information: <https://en.bitcoin.it/wiki/Running_Bitcoin#Command-line_arguments>.
+
+- Send a transaction to a given address:
+
+`bitcoin-cli sendtoaddress "{{address}}" {{amount}}`
+
+- Generate one or more blocks:
+
+`bitcoin-cli generate {{num_blocks}}`
+
+- Print high-level information about the wallet:
+
+`bitcoin-cli getwalletinfo`
+
+- List all outputs from previous transactions available to fund outgoing transactions:
+
+`bitcoin-cli listunspent`
+
+- Export the wallet information to a text file:
+
+`bitcoin-cli dumpwallet "{{path/to/file}}"`