Task edition improvements (#9)

This PR contains the work done to improve upon the editing experience on the **Task list item and the **New task** views.

Reviewed-on: rock-n-code/todos-app#9
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

App/Sources/Extensions/Character+Constants.swift

@@ -0,0 +1,11 @@
+// MARK: - Character+Constants
+
+extension Character {
+    
+    /// The newline character -`\n`-.
+    ///
+    /// Use this constant when checking for or comparing against newline characters
+    /// in text processing, making the code more expressive and self-documenting.
+    static let newline: Character = "\n"
+    
+}