Add readme

README.md

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+## Docker Registry Manager
+A simple CLI tool for managing Docker images in a private registry.
+
+### Build
+```sh
+make
+```
+
+### Configuration
+Ensure the .env file is present in the same directory as the executable with the following variables:
+```env
+REGISTRY_NAME=docker.example.com
+REGISTRY_USERNAME=
+REGISTRY_PASSWORD=
+```
+
+### Usage
+```sh
+$ docker-registry-manager
+Usage: registry [command] <args>
+
+Commands:
+  images     List all images in the registry
+  tags       List tags for a specific image
+  rm         Remove an image or tag from registry
+  push       Push an image to the registry
+  tag        Tag local image to push
+
+Examples:
+  registry images
+  registry tags my-image
+  registry rm my-image:latest
+  registry push my-image:latest
+  registry tag my-image:latest new-image:latest
+```