Added a file template containing the scribe copyright header

The template would be shown when scrolling to the bottom in the file creation menu, in a new category called "ScribeTemplates"

ScribeTemplates/ScribeHeader.xctemplate/TemplateInfo.plist

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>Identifier</key>
+    <string>com.example.templates.mytemplate</string>
+    <key>Kind</key>
+    <string>Xcode.IDEKit.TextSubstitutionFileTemplateKind</string>
+    <key>Ancestors</key>
+    <array>
+        <string>com.apple.dt.unit-test-class</string>
+    </array>
+</dict>
+</plist>
+

ScribeTemplates/ScribeHeader.xctemplate/___FILEBASENAME___.swift

@@ -0,0 +1,18 @@
+/** 
+  * [Describe what you want to do with your file here]
+  *
+  * Copyright (C) 2023 Scribe
+  *
+  * This program is free software: you can redistribute it and/or modify
+  * it under the terms of the GNU General Public License as published by
+  * the Free Software Foundation, either version 3 of the License, or
+  * (at your option) any later version.
+  *
+  * This program is distributed in the hope that it will be useful,
+  * but WITHOUT ANY WARRANTY; without even the implied warranty of
+  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  * GNU General Public License for more details.
+  *
+  * You should have received a copy of the GNU General Public License
+  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  */