Added TypeScript Types

[cseitz]

The following changes mirror what is being done to generate types in @ffmpeg-installer/ffmpeg

Utilizes tsc and JSdoc types to generate types. npm run types is added to the precommit hook and to package.json's prepare script.

[SavageCore]

This looks great after an initial look, thank you. Please give me a few days to merge, work is rather hectic!

[codecov-commenter]

Codecov Report

Merging #250 (85a6213) into master (148cb8b) will decrease coverage by 0.36%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #250      +/-   ##
==========================================
- Coverage   88.23%   87.87%   -0.36%     
==========================================
  Files           2        2              
  Lines          34       33       -1     
==========================================
- Hits           30       29       -1     
  Misses          4        4              

Impacted Files	Coverage Δ
index.js	85.18% <ø> (-0.53%)	:arrow_down:

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[xxRockOnxx]

@SavageCore just in case you forgot, pinging you about this.

[SavageCore]

@SavageCore just in case you forgot, pinging you about this.

Thanks for the ping, I did. Will get this sorted over the weekend!