Create README.md

Author: y-hatano-github

README.md

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+# 4-in-a-row-go
+CLI game '4-in-a-row' written in go.
+
+## What is 4-in-a-row?
+https://en.wikipedia.org/wiki/Four-in-a-row
+
+## How to get and run the code.
+### 1st step
+Get the code.
+```
+go get -d github.com/y-hatano-github/4-in-a-row-go
+```
+### 2nd step
+Change directory to the source code directory.
+```
+cd $GOPATH/src/github.com/y-hatano-github/4-in-a-row-go
+```
+### 3rd step
+Run the code.
+```
+go run main.go
+```
+