Restored SDK to the repository

.gitignore

@@ -56,16 +56,9 @@ Release/
 # Ignore Mac system files (if applicable)
 .DS_Store
 
-# Ignore all SDK source files (cpp/hpp)
-**/SDK/*.cpp
-**/SDK/*.hpp
-
 # Track archives (zip or 7z) in any SDK folder
 !**/SDK/*.zip
 !**/SDK/*.7z
 
-# Ignore a specific large file everywhere
-**/Assertions.inl
-
 # Track its archive
 !**/Assertions.7z