Add custom tag definitions for TSDoc

[fussel178]

Found something out this evening:
When you want custom tags in TSDoc, but the tsdoc eslint plugin won't let you, you can define a tsdoc.json beside the tsconfig.json in your project that gets passed to the eslint config.
In there you can define your own tags and much more (according to their documentation 😂):
https://www.npmjs.com/package/@microsoft/tsdoc-config

An example config could look like:

{
	"$schema": "https://developer.microsoft.com/json-schemas/tsdoc/v0/tsdoc.schema.json",
	"tagDefinitions": [
		{
			"tagName": "@preserve",
			"syntaxKind": "modifier"
		}
	]
}