Update README.md

README.md

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 ## Go Ethereum 1.8 with Timing
 
+## Compile
+Steps are the same as compiling the official Go Ethereum.
+
+1. Install `git`, `gcc`and `go`.
+2. Run `make geth` to compile.
+
+## Run
+
+Let's say the log file is `/path/to/file.txt`. Add `timing.output` flag in the front of the argument.
+
+Example:
+
+```shell
+geth --timing.output=/path/to/file.txt
+```
+
+```shell
+geth --timing.output=/path/to/file.txt --otherarguments...
+```
+
 ## License
 
 The go-ethereum library (i.e. all code outside of the `cmd` directory) is licensed under the