Add dev container

Signed-off-by: Jacob Woffenden <jacob.woffenden@digital.justice.gov.uk>

Author: Jacob Woffenden

.devcontainer/devcontainer.json

@@ -0,0 +1,9 @@
+{
+  "name": "devcontainer-community",
+  "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+  "features": {
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {},
+    "ghcr.io/devcontainers/features/node:1": {}
+  },
+  "postCreateCommand": "npm install --global @devcontainers/cli"
+}