Add LICENSE and README

Author: xiyaowong

LICENSE

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+MIT License
+
+Copyright (c) 2025 xiyaowong
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# toico
+
+toico is a tool for converting image files to ICO format
+
+# Installation
+
+Download the executable from the releases page, or install via cargo:
+
+```bash
+cargo install --git https://github.com/xiyaowong/toico
+```
+
+# Usage
+
+```bash
+toico -h
+```
+
+```
+Convert images to ICO format
+
+Usage: toico [OPTIONS] <IMAGE>
+
+Arguments:
+  <IMAGE>  The image file to convert
+
+Options:
+  -s, --size <SIZE>      The size of the icon in pixels: 16, 24, 32, 48, 64, 128, 256 [default: 64]
+  -o, --output <OUTPUT>  The output file name, defaults to the input file name
+
+                         If the --all option is specified, files will be saved in a directory named <output>_ico
+                         If --all is not specified, the file will be saved as <output>.ico
+
+  -a, --all              Whether to generate all icon sizes (16, 24, 32, 48, 64, 128, 256)
+  -f, --force            Force overwrite existing files
+  -h, --help             Print help
+  -V, --version          Print version
+
+
+Examples:
+    toico image.png --size 64
+    toico image.png -s 64 --output my_icon
+
+Tips:
+    Drag and drop an image file onto the executable to convert it to ICO format.
+```
+
+# License
+
+MIT