bitcoind config tuning techniques

Author: olegabr

docs/config.md

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+bitcoind config tuning
+======================
+
+You can use environment variables to customize config ([see docker run environment options](https://docs.docker.com/engine/reference/run/#/env-environment-variables)):
+
+        docker run -v bitcoind-data:/bitcoin --name=bitcoind-node -d \
+            -p 8333:8333 \
+            -p 127.0.0.1:8332:8332 \
+            -e DISABLEWALLET=1 \
+            -e PRINTTOCONSOLE=1 \
+            -e RPCUSER=mysecretrpcuser \
+            -e RPCPASSWORD=mysecretrpcpassword \
+            kylemanna/bitcoind
+
+Or you can use your very own config file like that:
+
+        docker run -v bitcoind-data:/bitcoin --name=bitcoind-node -d \
+            -p 8333:8333 \
+            -p 127.0.0.1:8332:8332 \
+            -v /etc/mybitcoin.conf:/bitcoin/.bitcoin/bitcoin.conf \
+            kylemanna/bitcoind