docs: add readme

Author: wojtek-krysiak

README.md

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+# AdminBro Addon template
+
+This an AdminBro addon template repository. You may use it if you want to create
+
+* AdminBro plugin
+* AdminBro adapter
+* AdminBro feature
+
+## What is inside
+
+It is a typescript repository with:
+
+* TypeScript
+* linter with semantic commits (ensures the same style across AdminBro packages)
+* semantic-release
+* github actions
+* example application with cypress
+
+What is missing:
+* cypress run in the CI which is an optional. You can take a look at admin-bro/core repository to see how to build it.
+
+## How to use it
+
+In order to start working on an AdminBro feature/plugin/adapter follow this steps:
+
+1. fork this repository
+2.