Update name and readme (#7)

* Tweaks to pxt and readme

* Update name to follow common format

Author: microbit-robert

README.md

@@ -1,4 +1,6 @@
-# Experimental MakeCode extension to run ML4F models
+# MakeCode extension to run ML4F models
+
+This extension is a work in progress. It supports unreleased work on the micro:bit machine learning tool.
 
 [![MakeCode Project](https://github.com/microbit-foundation/pxt-ml-runner-poc/actions/workflows/makecode.yml/badge.svg)](https://github.com/microbit-foundation/pxt-ml-runner-poc/actions/workflows/makecode.yml)
 [![Header Generator Tests](https://github.com/microbit-foundation/pxt-ml-runner-poc/actions/workflows/header-gen.yml/badge.svg)](https://github.com/microbit-foundation/pxt-ml-runner-poc/actions/workflows/header-gen.yml)

pxt.json

@@ -1,7 +1,7 @@
 {
-    "name": "ml-runner-poc",
+    "name": "machine-learning-runner",
     "version": "0.3.9",
-    "description": "Experimental extension to run ML4F models in micro:bit MakeCode",
+    "description": "Extension to run ML4F models in micro:bit MakeCode",
     "dependencies": {
         "core": "*"
     },