Add Support for Typescript

[manojpudasaini]

Could not find a declaration file for module 'editorjs-button'.
'*../node_modules/editorjs-button/dist/bundle.js' implicitly has an 'any' type.
Try npm i --save-dev @types/editorjs-button if it exists or add a new declaration (.d.ts) file containing declare module 'editorjs-button';