Merge pull request #2 from quephird/add_new_app_protocol

First try at adding new protocol for creating an app.

Sources/ScintillaLib/ScintillaApp.swift

@@ -0,0 +1,23 @@
+//
+//  File.swift
+//  
+//
+//  Created by Danielle Kefford on 9/24/22.
+//
+
+import Foundation
+
+public protocol ScintillaApp {
+    var filename: String { get set }
+    @WorldBuilder var body: (Light, Camera, [Shape]) { get }
+
+    init()
+}
+
+extension ScintillaApp {
+    public static func main() {
+        let instance = Self()
+        let canvas = World { return instance.body }.render()
+        canvas.save(to: instance.filename)
+    }
+}