Add README for hotfunctions go example and update docs to point to it

docs/hot-functions.md

@@ -19,8 +19,7 @@ input/output.
 
 ## Implementing a hot function
 
-In the [examples directory](https://github.com/treeder/functions/blob/master/examples/hotfunctions/http/func.go), there is one simple implementation of a hot function
-which we are going to get in the details here.
+Let's look at a simple hot function. The examples directory contains a [simple example of a hot function written in go](/examples/tutorial/hotfunctions/http/go). Here's [func.go](/examples/tutorial/hotfunctions/http/go/func.go) from that example. 
 
 The basic cycle comprises three steps: read standard input up to a previosly
 known point, process the work, the write the output to stdout with some

examples/tutorial/hotfunctions/http/go/README.md

@@ -0,0 +1,22 @@
+# Hot Function Example
+
+This is an example of a hot function. The [hot function documentation](/docs/hot-functions.md) contains an analysis of how this example works.
+
+### How to run the example
+
+Install the CLI tool, start a Fn server and run `docker login` to login to DockerHub. See the [front page](README.md) for instructions. 
+
+Set your Docker Hub username 
+
+```export FN_REGISTRY=<DOCKERHUB_USERNAME>
+```
+
+Build and deploy the function to the Fn server (default localhost:8080)
+
+fn deploy --app hot-app
+```
+
+Now call your function:
+
+```curl -X POST -d "World" http://localhost:8080/r/hot-app/%2Fhotfn-go
+```

examples/tutorial/hotfunctions/http/go/func.yaml

@@ -0,0 +1,6 @@
+name: hotfunction-http
+version: 0.0.10
+runtime: go
+entrypoint: ./func
+format: http
+path: /hotfn-go

examples/tutorial/hotfunctions/http/go/hotroute.json

@@ -1,6 +0,0 @@
-{"route":{
-  "memory": 64,
-  "type": "sync",
-  "config": null,
-  "format": "http"
-}}