update readme

README.md

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-# go-etcher
+# go-etcher
+
+go-etcher is a simple tool to create bootable drives that is mainly inspired by the deprecated  <a href="https://github.com/balena-io/etcher-cli">etcher-cli</a>
+
+# Usage
+```
+go-etcher [image] [device]
+```
+
+arguments: 
+```
+  -d, --device string   target device
+  -f, --force           override safety features
+  -i, --input string    input file
+```
+
+If no image or device is specified, etcher will enter interactive mode and prompt for the missing parameters.
+
+# Planned features
+- Windows support
+- prettier output
+- image OS detection via <a href="https://github.com/byReqz/pt">pt</a>