chore: add devcontainer setup

Author: marionebl

.devcontainer/devcontainer.json

@@ -0,0 +1,13 @@
+{
+    "name": "commitlint-dev",
+    "dockerComposeFile": ["../docker-compose.yml"],
+    "service": "commitlint",
+    "workspaceFolder": "/root/repo",
+    "shutdownAction": "stopCompose",
+    "extensions": [
+        "editorconfig.editorconfig",
+        "ms-vsliveshare.vsliveshare-pack",
+        "ms-azuretools.vscode-docker",
+        "esbenp.prettier-vscode"
+    ]
+}