feat: add mise and license

README.md

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+# fexcel
+
+A simple command-line tool to sanitize invalid UTF-8 sequences from input streams.
+
+## Overview
+
+`fexcel` reads data from stdin, replaces any invalid UTF-8 sequences with the Unicode replacement character (<28>), and writes the sanitized output to stdout. This is particularly useful when working with files that may contain mixed or invalid encodings, such as Windows-exported CSV files.
+
+## Installation
+
+```bash
+mise run install # or
+cargo install --path . --force
+```
+
+Or build from source:
+
+```bash
+cargo build --release
+```
+
+The binary will be available at `target/release/fexcel`.
+
+## Usage
+
+Use `fexcel` as a pipe filter to clean input before passing it to tools that require valid UTF-8:
+
+```bash
+cat my-windows-exported.csv | fexcel | csvlens
+```
+
+Without `fexcel`, tools like `csvlens` may fail with invalid UTF-8 errors. By piping through `fexcel` first, you can safely view and process files with encoding issues.
+
+### Additional Examples
+
+Clean a file and save the output:
+```bash
+cat problematic-file.txt | fexcel > cleaned-file.txt
+```
+
+Use with any UTF-8 sensitive tool:
+```bash
+cat messy-data.log | fexcel | grep "pattern"
+```
+
+## License
+
+See LICENSE file for details.