chore: init README

Signed-off-by: Olivier Vernin <[email protected]>

Author: olblak

README.md

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+# README
+
+This repository contains the source code for Updatecli plugins.
+
+A Updatecli plugin is a WASM module that can be used to extend Updatecli's capabilities.
+
+At the moment, Updatecli only support autodiscovery plugins.
+
+Plugins can be written in any programming language that can compile to WebAssembly (WASM).
+The Updatecli uses the framework [Extism](https://extism.org/docs/quickstart/plugin-quickstart)
+
+This project is still experimental and under active development.
+Feel free to share your feedbacks