Updating README to include Docker installation instruction.
Updating README to include Docker installation instruction.

rachellevanger/tda-persistence-explorer,rachellevanger/tda-d3-explorer,shaunharker/tda-d3-explorer,shaunharker/tda-d3-explorer,rachellevanger/tda-d3-explorer,shaunharker/tda-d3-explorer,shaunharker/tda-persistence-explorer,shaunharker/tda-d3-explorer,shaunharker/tda-persistence-explorer,rachellevanger/tda-d3-explorer,rachellevanger/tda-persistence-explorer,shaunharker/tda-persistence-explorer,rachellevanger/tda-persistence-explorer,rachellevanger/tda-persistence-explorer,shaunharker/tda-persistence-explorer,rachellevanger/tda-d3-explorer