improve the readme and example

Author: sylvestre

README.md

@@ -7,59 +7,48 @@
 
 The goal of this package is to be a dropped in replacement for the [diffutils commands](https://www.gnu.org/software/diffutils/) in Rust.
 
-
 Based on the incomplete diff generator in https://github.com/rust-lang/rust/blob/master/src/tools/compiletest/src/runtest.rs, and made to be compatible with GNU's diff and patch tools.
 
+
+## Installation
+
+Ensure you have Rust installed on your system. You can install Rust through [rustup](https://rustup.rs/).
+
+Clone the repository and build the project using Cargo:
+
+```bash
+git clone https://github.com/uutils/diffutils.git
+cd diffutils
+cargo build --release
 ```
-~/diffutils$ cargo run -- diff -u3 Cargo.lock Cargo.toml
+
+```bash
+
+cat <<EOF >fruits_old.txt
+Apple
+Banana
+Cherry
+EOF
+
+cat <<EOF >fruits_new.txt
+Apple
+Fig
+Cherry
+EOF
+
+$ cargo run -- -u fruits_old.txt fruits_new.txt
     Finished dev [unoptimized + debuginfo] target(s) in 0.00s
-     Running `target/debug/diff -u3 Cargo.lock Cargo.toml`
---- Cargo.lock
-+++ Cargo.toml
-@@ -1,39 +1,7 @@
--# This file is automatically @generated by Cargo.
--# It is not intended for manual editing.
--version = 3
--
--[[package]]
--name = "context-diff"
--version = "0.1.0"
--dependencies = [
-- "diff 0.1.12",
--]
--
--[[package]]
--name = "diff"
--version = "0.1.0"
--dependencies = [
-- "context-diff",
-- "normal-diff",
-- "unified-diff",
--]
--
--[[package]]
--name = "diff"
--version = "0.1.12"
--source = "registry+https://github.com/rust-lang/crates.io-index"
--checksum = "0e25ea47919b1560c4e3b7fe0aaab9becf5b84a10325ddf7db0f0ba5e1026499"
--
--[[package]]
--name = "normal-diff"
--version = "0.1.0"
--dependencies = [
-- "diff 0.1.12",
--]
--
--[[package]]
--name = "unified-diff"
--version = "0.3.0"
--dependencies = [
-- "diff 0.1.12",
-+[workspace]
-+members = [
-+    "lib/unified-diff",
-+    "lib/context-diff",
-+    "lib/normal-diff",
-+    "bin/diff",
- ]
+     Running `target/debug/diffutils -u fruits_old.txt fruits_new.txt`
+--- fruits_old.txt
++++ fruits_new.txt
+@@ -1,3 +1,3 @@
+ Apple
+-Banana
++Fig
+ Cherry
+
 ```
+
+## License
+
+diffutils is licensed under the MIT and Apache Licenses - see the `LICENSE-MIT` or `LICENSE-APACHE` files for details