Rust_EssentialNoteBook: add Clone and Add traits example
Rust_EssentialNoteBook: add Clone and Add traits example

c86j224s/snippet,c86j224s/snippet,c86j224s/snippet,c86j224s/snippet,c86j224s/snippet,c86j224s/snippet,c86j224s/snippet,c86j224s/snippet,c86j224s/snippet,c86j224s/snippet