Add support for codespaces

.devcontainer/devcontainer.json

@@ -0,0 +1,23 @@
+{
+    "name": "Deno",
+    "dockerFile": "Dockerfile",
+
+    // Set *default* container specific settings.json values on container create.
+    "settings": { 
+        "terminal.integrated.shell.linux": "/bin/bash"
+    },
+
+    // Add the IDs of extensions you want installed when the container is created.
+    "extensions": [
+        "denoland.vscode-deno"
+    ],
+
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [],
+
+    // Uncomment to use the Docker CLI from inside the container. See https://aka.ms/vscode-remote/samples/docker-from-docker.
+    // "mounts": [ "source=/var/run/docker.sock,target=/var/run/docker.sock,type=bind" ],
+
+    // Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.
+    // "remoteUser": "vscode"
+}