Added TypeScript instructions

[pjotrsavitski]

Updated README file to include instructions for using the package with TypeScript.

[codecov-commenter]

Codecov Report

Merging #16 (4f540e8) into master (fc0028a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #16   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           22        22           
=========================================
  Hits            22        22           

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[pjotrsavitski]

Not sure why, but GitHub seems to be removing the closing part for the suggested multi line comment.

[Uzlopak]

Why not providing the d.ts folder in this repo and referencing it in the package.json in the typings attribute?

Then you would provide the typings automatically without the necessity to install another dependency and if the typings are incomplete or wrong we just have to change them in this package and not somewhere else.

[Richienb]

@Uzlopak Sometimes, a maintainer is not interested in maintaining their own type definitions. We can only speculate for now.

[pjotrsavitski]

It seems that closing code block is missing. Probably due to some changes during resolving code comments.