Added install script and updated the README

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.1
+// swift-tools-version:5.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription

README.md

@@ -1,4 +1,30 @@
-# tlatia
+# Tlatia
 
-A description of this package.
-# tlatia
+A password-based utility to encrypt and decrypt files (like `ansible-vault`)
+
+## Requirements
+
+- Swift 5.0
+
+## Install
+
+```sh
+$ ./install.sh
+```
+
+This will build the executable and copy it under your `/usr/local/bin`
+directory for easy access.
+
+## Usage
+
+```sh
+$ tlatia OPERATION INPUT OUTPUT
+```
+
+- *OPERATION*: `encrypt` | `decrypt`
+- *INPUT*: Input file to encrypt or decrypt
+- *OUTPUT*: Output file where to write the result
+
+This will take a `utf8` encrypted file and ask for a password and then proceed
+to encrypt/decrypt your file. If you are encrypting it will ask a confirmation
+before proceeding.

Sources/tlatia/main.swift

@@ -32,7 +32,7 @@ enum Operation: String {
 }
 
 guard CommandLine.argc == 4 else {
-  print("Usage: tlatia OPERATION INPUT [OUTPUT]")
+  print("Usage: tlatia OPERATION INPUT OUTPUT")
   exit(EXIT_FAILURE)
 }
 

install.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+echo Building...
+swift build -c release
+
+echo Copying executable to "/usr/local/bin/"
+cp .build/release/tlatia /usr/local/bin/
+
+echo Finished...