Add permissions to workflow for Swift

Added permissions for read access to contents.

Signed-off-by: Christopher Jr Riley <chrisjr@cjrriley.com>

Author: MasterJ93

.github/workflows/swift.yml

@@ -3,6 +3,9 @@
 
 name: Swift
 
+permissions:
+  contents: read
+
 on:
   push:
     branches: [ "main" ]