docs: add README for DevContainer images with available versions

Author: y-developer

README.md

@@ -0,0 +1,31 @@
+# DevContainer Images
+
+Pre-built development container images with multiple language versions.
+
+## Available Images
+
+### Ubuntu Base Image
+| Ubuntu Version | Image                                      |
+| -------------- | ------------------------------------------ |
+| 22.04          | `ghcr.io/appzic/devcontainer-ubuntu:22.04` |
+| 24.04          | `ghcr.io/appzic/devcontainer-ubuntu:24.04` |
+
+### Node.js Images
+| Ubuntu Version | Node Version | Image                                   |
+| -------------- | ------------ | --------------------------------------- |
+| 24.04          | 18.x         | `ghcr.io/appzic/devcontainer-node:18.x` |
+| 24.04          | 20.x         | `ghcr.io/appzic/devcontainer-node:20.x` |
+| 24.04          | 22.x         | `ghcr.io/appzic/devcontainer-node:22.x` |
+| 24.04          | 24.x         | `ghcr.io/appzic/devcontainer-node:24.x` |
+
+## PHP + Node.js Images
+| Ubuntu Version | PHP Version | Node Version | Image                                                  |
+| -------------- | ----------- | ------------ | ------------------------------------------------------ |
+| 24.04          | 8.1         | 20.x         | `ghcr.io/appzic/devcontainer-php-node:php8.1-node20.x` |
+| 24.04          | 8.3         | 24.x         | `ghcr.io/appzic/devcontainer-php-node:php8.3-node24.x` |
+
+## Python Images
+| Ubuntu Version | Python Version | Image                                       |
+| -------------- | -------------- | ------------------------------------------- |
+| 24.04          | 3.7.3          | `ghcr.io/appzic/devcontainer-python:3.7.3`  |
+| 24.04          | 3.12.2         | `ghcr.io/appzic/devcontainer-python:3.12.2` |