Add Polish scale

[Agilulfo]

Initial draft changes to add the polish scale a.k.a. kurtyka scale
implements: #172

TODO:

• Add polish scale to csv file
• Update Readme
• Add polish scale implementation : src/scales/polish.ts
• reference scale in : src/scales/index.ts
• Add tests
• Generate json file
• Document how to add a scale

[github-actions]

Coverage report

Caution

Coverage does not meet threshold
Statements coverage not met for global: expected <=999999 not covered statements, but got 624

St.❔	Category	Percentage	Covered / Total
🟢	Statements	84.1% (-3.38% 🔻)	624/742
🟡	Branches	64.36% (-3.18% 🔻)	130/202
🟡	Functions	76.1% (-3.77% 🔻)	121/159
🟢	Lines	83.16% (-3.5% 🔻)	573/689

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🔴	scales/polish.ts	27.91%	9.09%	22.22%	26.83%

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	index.ts	100%	100%	35% (-1.84% 🔻)	100%

Test suite run success

270 tests passing in 18 suites.

Report generated by 🧪jest coverage report action from 0889500

[musoke]

This looks like you're on the right path! Let us know if you need help.

[Agilulfo]

@musoke thank you!
It might take me a while since I'm picking typescript as I go on my spare time.
Will let you know when it is ready for review