Add devcontainer

Author: lauritsen

.devcontainer/devcontainer.json

@@ -0,0 +1,10 @@
+{
+    "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+    "features": {
+        "ghcr.io/shyim/devcontainers-features/php:latest": {}
+    },
+    "mounts": [
+        "source=${env:HOME}${env:USERPROFILE}/.ssh,target=/home/vscode/.ssh,type=bind"
+    ],
+    "postCreateCommand": "composer install"
+}