Add NodeJS wrapper link

[Maxim-Mazurok]

I created the NPM package that uses java implementation of ez-vcard and provides API for generating vCards from NodeJS (with TypeScript support). I tested it on Windows, WSL, Ubuntu, and Mac. Will appreciate any help with testing or development. The next goal is to add more options to VcardData interface. Here's the source code of this package: Maxim-Mazurok/ez-vcard

This PR adds a link to this NPM package in the README.

[codecov-commenter]

Codecov Report

Merging #110 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             master   #110   +/-   ##
=======================================
  Coverage        80%    80%           
  Complexity     2723   2723           
=======================================
  Files           211    211           
  Lines          8410   8410           
  Branches       1289   1289           
=======================================
  Hits           6751   6751           
  Misses         1382   1382           
  Partials        277    277           

[mangstadt]

Thanks for doing this! I added a link to your project in a new section of the README.

Good luck with the project! :)

[Maxim-Mazurok]

Thank you!