Add description to README.md and lib.rs

Author: einfachIrgendwer0815

README.md

@@ -1,2 +1,37 @@
-# onetime-cli
-Encrypt / decrypt file using the one-time-pad
+# Onetime-cli
+
+Encrypt / decrypt files using the one-time-pad.
+
+## Install
+
+If you have cargo installed, run:
+```bash
+cargo install onetime-cli
+```
+
+Otherwise you can download an executable from the [Release section](https://github.com/einfachIrgendwer0815/onetime-cli/releases).
+
+
+
+## Usage
+
+The simplest way to encrypt a file called `secret.txt` is:
+```bash
+onetime-cli encrypt secret.txt
+```
+which will generate two new files `secret.txt.otp.0` and `secret.txt.otp.1`. You can then delete `secret.txt`.
+
+
+
+To decrypt `secret.txt`, run:
+```bash
+onetime-cli decrypt secret.txt
+```
+which will use the two `secret.txt.otp.*` files to decrypt `secret.txt`. You can then delete these two files.
+
+
+
+To see more possible cli arguments, run:
+```bash
+onetime-cli --help
+```

src/lib.rs

@@ -1,3 +1,35 @@
+//! # Onetime-cli
+//!
+//!Encrypt / decrypt files using the one-time-pad.
+//! 
+//! ## Usage
+//!
+//! The simplest way to encrypt a file called `secret.txt` is:
+//!
+//! ```bash
+//! onetime-cli encrypt secret.txt
+//! ```
+//!
+//! which will generate two new files `secret.txt.otp.0` and `secret.txt.otp.1`. You can then delete `secret.txt`.
+//!
+//!
+//!
+//! To decrypt `secret.txt`, run:
+//!
+//! ```bash
+//! onetime-cli decrypt secret.txt
+//! ```
+//!
+//! which will use the two `secret.txt.otp.*` files to decrypt `secret.txt`. You can then delete these two files.
+//!
+//!
+//!
+//! To see more possible cli arguments, run:
+//!
+//! ```bash
+//! onetime-cli --help
+//! ```
+
 pub mod args;
 
 mod otp;