Add CloseFile override for ZipFileSystem

add gitignore for out (default for CPM/FetchContent/Visual Studio in-source builds)

Author: psyinf

.gitignore

@@ -30,3 +30,5 @@
 /build
 /examples/build
 .vscode/settings.json
+
+/out/**

include/vfspp/ZipFileSystem.hpp

@@ -144,7 +144,13 @@ class ZipFileSystem final : public IFileSystem
     {
         return false;
     }
-
+    /*
+    * Close file 
+    */
+    virtual void CloseFile(IFilePtr file) override
+    {
+        //NO-OP
+    }
     /*
      * Check if file exists on filesystem
      */