Add README.md with build instructions and usage details

README.md

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+# etherip-client
+
+[etherip-kmod](https://git.neody.ad.jp/tuna2134/etherip-kmod)のクライアント
+
+## ビルド
+```
+go build .
+```
+
+## 使い方
+
+```
+Ethernet over IPv6
+
+Usage:
+  etherip-client [command]
+
+Available Commands:
+  add         Ethernet over IPv6(RFC3378)カーネルのクライアント
+  completion  Generate the autocompletion script for the specified shell
+  delete      Delete iface
+  help        Help about any command
+
+Flags:
+  -h, --help   help for etherip-client
+
+Use "etherip-client [command] --help" for more information about a command.
+```