Create README

README..md

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+# m-grep 🔍
+
+A simple grep-like tool written in Rust.
+
+## Installation
+
+```bash
+git https://codeberg.org/bux/m-grep.git
+cd m-grep
+cargo build --release
+```
+
+## Usage
+
+```bash
+# Basic search
+m-grep <query> <file>
+
+# Case-insensitive
+m-grep -i <query> <file>
+```
+
+### Examples
+
+```bash
+m-grep "hello" src/main.rs
+m-grep -i "WHO" poem.txt
+```