Update README with project details and installation guide

Added project description and installation instructions for Swift Package Manager and Xcode.

Author: helbertgs

README.md

@@ -1,4 +1,36 @@
 ### OpenSpatial
 [![codecov](https://codecov.io/github/helbertgs/OpenSpatial/graph/badge.svg?token=7WrVJPx17w)](https://codecov.io/github/helbertgs/OpenSpatial)
 ![Language](https://img.shields.io/badge/Swift-6.1-orange.svg)
-[![Swift](https://github.com/helbertgs/OpenSpatial/actions/workflows/swift.yml/badge.svg)](https://github.com/helbertgs/OpenSpatial/actions/workflows/swift.yml)
+[![Swift](https://github.com/helbertgs/OpenSpatial/actions/workflows/swift.yml/badge.svg)](https://github.com/helbertgs/OpenSpatial/actions/workflows/swift.yml)
+
+Open-source implementation of Apple's [Spatial](https://developer.apple.com/documentation/spatial) framework to Create and manipulate 3D mathematical primitives.
+
+The main goal of this project is to provide a compatible, reliable and efficient implementation which can be used on Apple's operating systems before iOS 16.0, iPadOS 16.0, macOS 13.0, tvOS 16.0, watchOS 9.0, as well as Linux, Windows and WebAssembly.
+
+### Installation
+##### Swift Package Manager
+To add `OpenSpatial` to your [SwiftPM](https://swift.org/package-manager/) package, add the `OpenSpatial` package to the list of package and target dependencies in your `Package.swift` file.
+
+```swift
+dependencies: [
+    .package(url: "https://github.com/helbertgs/OpenSpatial.git", branch: "main")
+],
+targets: [
+    .target(
+        name: "MyAwesomePackage",
+        dependencies: [
+            .product(name: "OpenSpatial", package: "OpenSpatial")
+        ]
+    ),
+]
+```
+
+###### Xcode
+`OpenSpatial` can also be added as a SwiftPM dependency directly in your Xcode project *(requires Xcode 11 upwards)*.
+
+To do so, open Xcode, use **File** → **Swift Packages** → **Add Package Dependency…**, enter the [repository URL](https://github.com/helbertgs/OpenSpatial.git), choose the latest available version, and activate the checkboxes:
+
+<p align="center">
+<img alt="Select the OpenSpatial target" 
+	src="" width="70%">
+</p>