Add SdkNoticeTypeRepository to README documentation (#41)

* Initial plan

* Add SdkNoticeTypeRepository reference to README

Co-authored-by: rousso <91379+rousso@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: rousso <91379+rousso@users.noreply.github.com>

Author: Copilot

src/main/java/eu/europa/ted/eforms/sdk/repository/README.md

@@ -9,4 +9,5 @@ This package contains:
 
 * `SdkFieldRepository`: can populate a `HashMap` with `SdkField` objects read form `fields.json`
 * `SdkNodeRepository`: can populate a `HashMap` with `SdkNode` objects read form `fields.json`
-* `SdkCodelistRepository`: can populate a `HashMap` with `SdkCodelist` objects (including all codelist codes), by reading the `.gc` files from the `codelists` folder of the eForms SDK.
+* `SdkCodelistRepository`: can populate a `HashMap` with `SdkCodelist` objects (including all codelist codes), by reading the `.gc` files from the `codelists` folder of the eForms SDK.
+* `SdkNoticeTypeRepository`: can populate a `HashMap` with `SdkNoticeSubtype` objects read from `notice-types.json`