chore: add simple README files for internal extensions

As we want to show README files of extensions, we should
have some to be displayed.

related to podman-desktop#6084

Signed-off-by: Florent Benoit <[email protected]>

extensions/compose/README.md

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+# Compose Extension
+
+The Compose Extension allows to setup compose binary so `podman compose` commands can work.

extensions/docker/README.md

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+# Docker extension
+
+Docker extension detects if docker engine is running and if running, it'll register the socket to Podman Desktop.
+
+Then, you can monitor containers, images, volumes, etc. from Podman Desktop.

extensions/kind/README.md

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+# kind extension
+
+This extension adds the support of https://kind.sigs.k8s.io/
+
+By using this extension, it is possible to create kubernetes clusters
+running on top of the container engine.
+
+You can initialize a kind cluster using Settings/Resources.

extensions/kube-context/README.md

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+# kube-context extension
+
+This extensions allows to list and switch the current kubernetes context.
+
+It displays the contexts in the tray icon or in the status bar.

extensions/lima/README.md

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+# Lima extension
+
+This extension allows to create Lima VM used to have a podman or docker engine.
+
+More information on Lima: https://github.com/lima-vm/lima

extensions/podman/README.md

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+# Podman extension
+
+This extension handles:
+
+- monitor the podman machines on Linux, macOS and Windows
+- creation of podman machines on macOS and Windows
+- connect to the podman socket so you can see the containers, images, volumes, etc. from podman

extensions/registries/README.md

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+# Registries extension
+
+This extension registers some default registries so users don't have to
+enter the full URL.
+
+example: There is a quay.io with the icon, no need to enter `quay.io`
+
+Only need to provide login and password when you want to connect.