[DO NOT MERGE] Compute@Edge spike

.gitignore

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 coverage
+
+/compute@edge/node_modules
+/compute@edge/bin
+/compute@edge/pkg

compute@edge/README.md

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+# Fastly Compute@Edge test
+
+This directory contains a definition for a Fastly [Compute@Edge](https://docs.fastly.com/products/compute-at-edge) service. The existing, VCL-based backend, is configured as a backend of this service.
+
+The intention is to slowly migrate functionality from VCL to Compute@Edge, deploying both services in tandem after each change, and then remove the existing VCL backend once all the functionality has been migrated.
+
+## Common tasks
+
+- To run the test suite: `npm test`
+- To start development server: `npm run serve`
+
+## Deployment
+
+- Install the [Fastly CLI](https://developer.fastly.com/reference/cli/)
+- Create a Fastly API token with full access to the **Staging Compute@Edge Test** service (service ID `0yW7THGQHtorLIDxhrcWx4`)
+- Create a Fastly CLI profile with `fastly profile create`, providing the API token you just generated
+- Run `npm run deploy`

compute@edge/fastly.toml

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+# This file describes a Fastly Compute@Edge package. To learn more visit:
+# https://developer.fastly.com/reference/fastly-toml/
+
+language = "javascript"
+manifest_version = 2
+name = "govuk-fastly"
+service_id = "0yW7THGQHtorLIDxhrcWx4"
+
+[scripts]
+  build = "npm exec webpack && npm exec js-compute-runtime ./bin/index.js ./bin/main.wasm"
+
+[local_server]
+  [local_server.backends]
+    [local_server.backends.origin]
+      url="http://localhost:3000"