Add simple hello world sample

samples/helloworld/README.md

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+# Hello World Example
+
+To run the example on http://localhost:8080
+
+```sh
+$ ./workerd serve config.capnp
+```
+
+To run using bazel
+
+```sh
+$ bazel run //src/workerd/server:workerd -- serve ~/cloudflare/workerd/samples/helloworld/config.capnp
+```
+
+To create a standalone binary that can be run:
+
+```sh
+$ ./workerd compile config.capnp > helloworld
+
+$ ./helloworld
+```
+
+To test:
+
+```sh
+% curl http://localhost:8080
+Hello World
+```

samples/helloworld/config.capnp

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+# Imports the base schema for workerd configuration files.
+
+# Refer to the comments in /src/workerd/server/workerd.capnp for more details.
+
+using Workerd = import "/workerd/workerd.capnp";
+
+# A constant of type Workerd.Config defines the top-level configuration for an
+# instance of the workerd runtime. A single config file can contain multiple
+# Workerd.Config definitions and must have at least one.
+const helloWorldExample :Workerd.Config = (
+
+  # Every workerd instance consists of a set of named services. A worker, for instance,
+  # is a type of service. Other types of services can include external servers, the
+  # ability to talk to a network, or accessing a disk directory. Here we create a single
+  # worker service. The configuration details for the worker are defined below.
+  services = [ (name = "main", worker = .helloWorld) ],
+
+  # Every configuration defines the one or more sockets on which the server will listene.
+  # Here, we create a single socket that will listen on localhost port 8080, and will
+  # dispatch to the "main" service that we defined above.
+  sockets = [ ( name = "http", address = "*:8080", http = (), service = "main" ) ]
+);
+
+# The definition of the actual helloWorld worker exposed using the "main" service.
+# In this example the worker is implemented as a single simple script (see worker.js).
+# The compatibilityDate is required. For more details on compatibility dates see:
+#   https://developers.cloudflare.com/workers/platform/compatibility-dates/
+
+const helloWorld :Workerd.Worker = (
+  serviceWorkerScript = embed "worker.js",
+  compatibilityDate = "2022-09-16",
+);

samples/helloworld/worker.js

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+addEventListener('fetch', event => {
+  event.respondWith(handle(event.request));
+});
+
+async function handle(request) {
+  return new Response("Hello World\n");
+}

samples/helloworld_esm/README.md

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+# Hello World Example
+
+To run the example on http://localhost:8080
+
+```sh
+$ ./workerd serve config.capnp
+```
+
+To run using bazel
+
+```sh
+$ bazel run //src/workerd/server:workerd -- serve ~/cloudflare/workerd/samples/helloworld_esm/config.capnp
+```
+
+To create a standalone binary that can be run:
+
+```sh
+$ ./workerd compile config.capnp > helloworld
+
+$ ./helloworld
+```
+
+To test:
+
+```sh
+% curl http://localhost:8080
+Hello World
+```

samples/helloworld_esm/config.capnp

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+# Imports the base schema for workerd configuration files.
+
+# Refer to the comments in /src/workerd/server/workerd.capnp for more details.
+
+using Workerd = import "/workerd/workerd.capnp";
+
+# A constant of type Workerd.Config defines the top-level configuration for an
+# instance of the workerd runtime. A single config file can contain multiple
+# Workerd.Config definitions and must have at least one.
+const helloWorldExample :Workerd.Config = (
+
+  # Every workerd instance consists of a set of named services. A worker, for instance,
+  # is a type of service. Other types of services can include external servers, the
+  # ability to talk to a network, or accessing a disk directory. Here we create a single
+  # worker service. The configuration details for the worker are defined below.
+  services = [ (name = "main", worker = .helloWorld) ],
+
+  # Every configuration defines the one or more sockets on which the server will listene.
+  # Here, we create a single socket that will listen on localhost port 8080, and will
+  # dispatch to the "main" service that we defined above.
+  sockets = [ ( name = "http", address = "*:8080", http = (), service = "main" ) ]
+);
+
+# The definition of the actual helloWorld worker exposed using the "main" service.
+# In this example the worker is implemented as an ESM module (see worker.js).
+# The compatibilityDate is required. For more details on compatibility dates see:
+#   https://developers.cloudflare.com/workers/platform/compatibility-dates/
+
+const helloWorld :Workerd.Worker = (
+  modules = [
+    (name = "worker", esModule = embed "worker.js")
+  ],
+  compatibilityDate = "2022-09-16",
+);

samples/helloworld_esm/worker.js

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+export default {
+  async fetch(req, env) {
+    return new Response("Hello World\n");
+  }
+};