Add README

README.md

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+# TODO CLI - Rust
+
+A simple command-line todo list app built in Rust.
+My first Rust project while learning the language.
+
+## Features
+- Create tasks with name, priority, and description
+- Delete tasks
+- List all tasks
+- Save and load tasks from file
+
+## How to run
+```
+cargo run
+```