Adds dev container and updates docs with Codespaces information

Signed-off-by: Samruddhi Khandale <samruddhikhandale@github.com>

.devcontainer/devcontainer.json

@@ -0,0 +1,20 @@
+// For format details, see https://aka.ms/devcontainer.json.
+{
+    "name": "Knative Serving",
+    "image": "gcr.io/knative-tests/test-infra/prow-tests:latest",
+
+    // Features to add to the dev container. More info: https://containers.dev/features.
+    "features": {
+        "ghcr.io/devcontainers/features/go:1": {}
+    },
+
+    "privileged": true,
+    "postStartCommand": "service docker start",
+    "mounts": [
+        {
+            "source": "dind-var-lib-docker",
+            "target": "/docker-graph",
+            "type": "volume"
+        }
+    ]
+}

DEVELOPMENT.md

@@ -16,6 +16,16 @@ meet these requirements, you can make changes and
 
 Before submitting a PR, see also [CONTRIBUTING.md](./CONTRIBUTING.md).
 
+## Getting started with GitHub Codespaces
+
+To get started, create a codespace for this repository by clicking this 👇
+
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?hide_repo_select=true&ref=main&repo=118828329)
+
+A codespace will open in a web-based version of Visual Studio Code. The [dev container](.devcontainer/devcontainer.json) is fully configured with software needed for this project.
+
+**Note**: Dev containers is an open spec which is supported by [GitHub Codespaces](https://github.com/codespaces) and [other tools](https://containers.dev/supporting).
+
 ### Sign up for GitHub
 
 Start by creating [a GitHub account](https://github.com/join), then set up