readme added

Author: Philipp Speck

README.md

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+# `iconize` - Convert images to Windows icon files
+
+`iconize` is a command line tool to convert an images to a multisize Windows icon file.
+
+[![Go Report Card](https://goreportcard.com/badge/github.com/typomedia/iconize)](https://goreportcard.com/report/github.com/typomedia/iconize)
+[![Go Reference](https://pkg.go.dev/badge/github.com/typomedia/iconize.svg)](https://pkg.go.dev/github.com/typomedia/iconize)
+
+## Install
+
+    go install github.com/typomedia/iconize@latest
+
+## Usage
+
+    iconize [options] [file]
+
+## Options
+
+    -o, --out string   output ico file
+
+## Example
+
+    iconize -o icon.ico icon.png
+
+---
+Copyright © 2023 Typomedia Foundation. All rights reserved.