Added "Copy Code" Button #2446#3392

Harshit-7373 wants to merge 1 commit intoprocessing:developprocessing/p5.js-web-editor:developfrom

Harshit-7373:Harshit-7373/Solved-issue-#2446Harshit-7373/p5.js-web-editor:Harshit-7373/Solved-issue-#2446Copy head branch name to clipboard