Update README.

README.md

@@ -1,5 +1,17 @@
 # iiif-metadata-component
 
+## Getting started
+
     npm i
     npm run build
-    npm start
+    npm start
+
+This will launch a demo on http://localhost:3000/examples that you can use for interactive testing.
+
+## Making a release
+
+First decide on a new version number (x.y.z) using [semantic versioning](https://semver.org/). Then run these commands, being sure to substitute the real version number for x.y.z below:
+
+    npm i
+    npm version x.y.z
+    npm publish