add: README

README.md

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+keep waking Windows up
+
+[![Go Report Card](https://goreportcard.com/badge/github.com/shu-go/vvin)](https://goreportcard.com/report/github.com/shu-go/vvin)
+![MIT License](https://img.shields.io/badge/License-MIT-blue)
+
+# Usage
+
+```
+Sub commands:
+  minimize, min     minimize/restore
+  maximize, max     maximize/restore
+  resize, move, mv  resize/move
+  alpha             set alpha 0%(transparent) - 100%(opaque)
+  topmost           set always on top/restore
+
+Options:
+  -t, --target WINDOW_TITLE  default to current window
+```
+
+## minimize/restore
+
+```
+> ./vvin -t Notepad min
+
+> ./vvin -t Notepad min --restore
+> ./vvin -t Notepad min -r
+```
+
+## resize
+
+```
+> ./vvin -t notepad resize -x 0 -y 0 -w 60% -h 100%
+```
+
+## alpha
+
+```
+> ./vvin -t notepad alpha 75%
+```
+
+## always on top
+
+```
+> ./vvin -t notepad topmost
+
+> ./vvin -t notepad topmost --restore
+> ./vvin -t notepad topmost -r
+```