feat(milestones): add new options to exempt all milestones (#291)

* refactor: move and rename the interfaces/classes

closes #272

* docs: update the readme and action to describe the new options for milestones

* refactor: split the tests into multiple files

* feat(milestones): add new options to exempt all milestones

* test: add coverage for the default values

* test(milestones): add more coverage (wip)

* test(milestones): add more coverage for the multiple exempt milestones

* test: reduce duplicated code

* test: change some describes

* test: add more coverage

* test: add more coverage

* test: add final coverage

* build(tsc): add missing project flag to build with the right tsconfig

* test(milestones): use each to reduce the complexity of the tests

* chore: fix an eslint issue with prettier on windows

the end of line was wrong each time the os process the files

* docs: move the contribution section to a dedicated file

add more content to help the debug

* chore: make sure the rebase is ok

CONTRIBUTING.md

@@ -0,0 +1,19 @@
+### Building and testing
+
+Install the dependencies.
+
+```bash
+$ npm install
+```
+
+Build the typescript and package it for distribution.
+
+```bash
+$ npm run build && npm run pack
+```
+
+Run the tests :heavy_check_mark:
+
+```bash
+$ npm test
+```