DIR: /example-sim/js/example/view/ControlPanel.js

• Added new modules requires
• Altered signature to accept ParentNode and ModelViewTransform2 objects to simplify getting bounds and adding new elements.
• Added 2 new text button objects with listeners containing prescribed logic
• Added logic to reset function to remove elements

DIR: /example-sim/js/example/view/ExampleScreenView.js

• Passed proper variables to altered object constructors

DIR: /example-sim/example-sim-strings_en.json

• Updated with additional keys and text values

• Dockerfile to create a Node.js container, install the dependencies found in the development overview, copy the simulation sourecode, and run a simple http server

1. make the development directory

$ mkdir phetsims && cd phetsims

2. clone all dependencies according to development overview (Note: I added query-string-machine as I was recieving 404 errors)

3. build the container (ensure the dockerfile is in the current directory)

$ docker build -t your-tag-name .

4. run the following command to access a terminal prompt in the guest container

$ docker run -it -v "$PWD":/usr/src/app your-image-name bash

   - execute the npm and grunt commads in the /chipper and /example-sim or /simula-rasa directories
   - `$ exit` the shell

5. finally, you should be able to run the container

$ docker run -d -p 32789:8080 -v "$PWD":/usr/src/app your-image-name

   - removing the `-d` flag will print server reqests/responses to the screen
   - replacing `-p 32789:8080` with `-P` with randomly assign a host port — user `$ docker ps` for running container info