Update README.md [skip ci]

- add codecov and ci badges

Author: gesinn-it-ilm

README.md

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-<!-- README -->
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 # HidePrefix
 
+![ci](https://github.com/gesinn-it-pub/mediawiki-extensions-HidePrefix/actions/workflows/ci.yml/badge.svg)
+[![codecov](https://codecov.io/github/gesinn-it-pub/mediawiki-extensions-HidePrefix/graph/badge.svg?token=pdUWtEQ8rB)](https://codecov.io/github/gesinn-it-pub/mediawiki-extensions-HidePrefix)
+
 The HidePrefix extension hides prefix in links and page titles.
 
 For example, wikitext `[[Help:FAQ]]' normally results in link `Help:FAQ'. If this extension is
@@ -36,5 +37,3 @@ full license text.
 * Extension page: https://www.mediawiki.org/wiki/Extension:HidePrefix
 * Author page:    https://www.mediawiki.org/wiki/User:Van_de_Bugger
 * License page:   https://www.gnu.org/licenses/agpl.html
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-<!-- end of file -->