Update README.md (#743)

Point 2. changed `yarn -rf` to `rm -rf`

Added point 6. because on entering `localhost:1234` app return alert which might be confusing for new programmers.

Co-authored-by: Na Li <[email protected]>

Author: Shandelier

pose-detection/demos/README.md

@@ -39,10 +39,12 @@ If you want to run any of the demos locally, follow these steps:
 
 1. Go to the demo folder, e.g. `cd live_video`
 
-2. Remove cache etc. `yarn -rf .cache dist node_modules`
+2. Remove cache etc. `rm -rf .cache dist node_modules`
 
 3. Build dependency. `yarn build-dep`
 
 4. Install dependencies. `yarn`
 
 5. Run the demo. `yarn watch`
+
+6. The demo runs at `localhost:1234`. (Remember to provide URL model parameter e. g. `localhost:1234/?model=movenet`)