update readme

readme.md

 # HUDS developer guide, basic workflow
 
+## Install
+
+1. `yarn install`
+2. `yarn start` should start a dev server in port 3333. It displays the content from src/index.html
+
 ## Stencil
 
 1. Have discussions with designers, agree on basic functionality
-2. run `yarn generate` and start development
+2. run `yarn generate` to generate a blanc component and start developing
 3. Extract useful helper components, such as `<hy-row> <hy-column>`
 4. Review the design with designer and PO or a colleague
 5. Check with basic accessibility tools (TBD which tools?!?)
@@ -75,4 +80,3 @@ NOTE: If you want to use "watchdocs" or "build.watch" scripts, you must include
 For example:
 
 `docker run -v ${PWD}:/usr/src/app -p 3333:3333 helsinkifi/huds build`
-