docs: add README, feat: add dependabot config

Signed-off-by: K.B.Dharun Krishna <[email protected]>

README.md

@@ -1,3 +1,23 @@
 # vib-dnf
 
-DNF has been added as a built-in module to Vib directly. So, this repository is no longer required.
+This repository contains the Vib (Vanilla Image Builder) plugin for the DNF (Dandified YUM) package manager.
+
+## Usage
+
+It can be used in a workflow with the following syntax:
+
+```yml
+- uses: vanilla-os/[email protected]
+  with:
+    recipe: 'recipe.yml'
+    plugins: 'kbdharun/vib-dnf:v0.1'
+```
+
+## Building the plugin
+
+The plugin can be built locally with the following commands:
+
+```sh
+go get ./...
+go build -trimpath -buildmode=plugin -o dnf.so -v ./...
+```

dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "monthly"