add readme

README

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+# blockbook
+
+## Install
+
+Setup go environment:
+
+```
+sudo apt-get install golang
+sudo apt-get install git
+go help gopath
+```
+
+Install RocksDB: https://github.com/facebook/rocksdb/blob/master/INSTALL.md
+
+```
+sudo apt-get install libgflags-dev libsnappy-dev zlib1g-dev libbz2-dev liblz4-dev libzstd-dev
+cd /path/to/rocksdb
+make static_lib
+```
+
+Install gorocksdb: https://github.com/tecbot/gorocksdb
+
+```
+CGO_CFLAGS="-I/path/to/rocksdb/include" \
+CGO_LDFLAGS="-L/path/to/rocksdb -lrocksdb -lstdc++ -lm -lz -lbz2 -lsnappy -llz4 -lzstd" \
+  go get github.com/tecbot/gorocksdb
+```
+
+Install blockbook:
+
+```
+go get github.com/jpochyla/blockbook
+```
+
+## Usage
+
+```
+$GOPATH/bin/blockbook --help
+```