add readme

readme.md

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+# complete
+
+WIP
+
+a tool for bash writing bash completion in go.
+
+## example: `go` command bash completion
+
+Install in you home directory:
+
+```
+go build -o ~/.bash_completion/go ./gocomplete
+echo "complete -C ~/.bash_completion/go go" >> ~/.bashrc
+```
+
+Or, install in the root directory:
+
+```
+sudo go build -o /etc/bash_completion.d/go ./gocomplete
+```
+