populate the service information page for the API Gateway

Closes #109 (closed)

docs/services/api-gateway.md

 # API Gateway
 
-This page documents key information about the API Gateway service.
+This page gives an overview of the API Gateway service.
 
-Environments and Servers they run on
-------------------------------------
+## Service Description
 
-- [Production]({link to application}) {link to api if applicable (see information-asset-register.md)}
-    - {list the servers the application is deployed to (see self-service-gateway.md) or link to cluster management (see information-asset-register.md)}
-- [Test]({link to application}) {include link to api if applicable see information-asset-register.md}
-    - {list the servers the application is deployed to (see self-service-gateway.md) or link to cluster management (see information-asset-register.md)}
-- {any other environments}
+The API Gateway service allows people to publish APIs via
+https://api.apps.cam.ac.uk/ which make use of common quota enforcement,
+developer registration and authentication.
 
-Application repositories
-------------------------
-- [{application component 1}]({link to repo})
-- [{application component 2}]({link to repo})
+A developer portal allowing self-service registration of applications which make
+use of the published APIs is at https://developer.api.apps.cam.ac.uk/.
 
-Technology
-----------
+## Service Status
 
-| Category | Language | Framework |
+This service is currently an *ALPHA* offering.
+
+## Contact
+
+Issues with the service should be raised on the [corresponding GitLab
+project](https://gitlab.developers.cam.ac.uk/uis/devops/api/gateway-ops)
+(University members only).
+
+## Environments
+
+The API Gateway is hosted by our vendor, Apigee.
+
+## Source code
+
+Terraform which drives the API Gateway is developed in a [dedicated project on
+GitLab](https://gitlab.developers.cam.ac.uk/uis/devops/api/gateway-ops).
+
+## Technologies used
+
+The following gives an overview of the technologies the API Gateway is built on.
+
+| Category | Language | Framework(s) |
 | -------- | -------- | --------- |
-| Server | {name and version} | {name and version} |
-| Client | {name and version} | {name and version} |
-| {other} | {name and version} | {name and version} |
-
-Deployment
-----------
-{brief description of technologies involved - links where appropriate (use completed templates as guide)}
-
-Deployment repository
----------------------
-- [{application deployment repo 1}]({link to repo})
-- [{application deployment repo 2}]({link to repo})
-
-Service Owner
--------------
-[{Full Name}](https://www.lookup.cam.ac.uk/person/crsid/{crsid})
-
-Service Managers
-----------------
-[Abraham Martin](https://www.lookup.cam.ac.uk/person/crsid/amc203)
-
-Current Status
---------------
-Planning
-
-Documentation
--------------
-- [{description of documentation 1}]({link to documentation})
-- [{description of documentation 2}]({link to documentation})
+| Configuration | Apigee proprietary | N/A |
+| Deployment | terraform | N/A |
+
+## Deployment
+
+Deployment is via terraform using our
+[logan](https://gitlab.developers.cam.ac.uk/uis/devops/tools/logan/) tool. There
+are currently two terraform workspaces:
+
+* `development` which manages a testing Apigee organisation named
+    "devopsaccountrecoveryapigeestaging-eval"
+* `production` which manages the production Apigee organisation named "cam"
+
+## Documentation
+
+Dedicated operational documentation is hosted [within the GitLab
+project](https://gitlab.developers.cam.ac.uk/uis/devops/api/gateway-ops/-/tree/master/doc).
+
+End-user documentation is hosted on the [Developer
+portal](https://developer.api.apps.cam.ac.uk/).
+
+## Service Management and tech lead
+
+The **service owner** for the API gateway is currently vacant.
+
+The **service manager** for the API gateway is currently vacant.
+
+The **tech lead** for the API gateway is [Rich
+Wareham](https://www.lookup.cam.ac.uk/person/crsid/rjw57).
+
+The following engineers have operational experience with the API Gateway and are able
+to respond to support requests or incidents:
+
+* [Monty Dawson](https://www.lookup.cam.ac.uk/person/crsid/wgd23)