add typings to react-method-elements

[aoloo]

Description
TypeScript cannot find the type declaration for react-method-elements

Proposed solution
add typings to react-method-elements for typescript support

alternative solution
https://bobbyhadz.com/blog/typescript-could-not-find-a-declaration-file-for-module
https://stackoverflow.com/questions/41292559/could-not-find-a-declaration-file-for-module-module-name-path-to-module-nam